Tag Archives: roads

Why is Chicago building a new roadway between the Loop and Chinatown?

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The Chicago Tribune presented this headline yesterday: “Mayor proposes new roadway between downtown, Chinatown.” When I first saw this, I thought this might be something along the lines of the Crosstown Expressway, a major new arterial roadway connecting two areas. However, the article seems to emphasize the importance of safety:

The $62 million project, called the Wells-Wentworth Connector, would also realign Wentworth Avenue between Archer and Cermak roads to bring this section of Wentworth in line with the portion of Wentworth south of Cermak, according to the Chicago Department of Transportation.

The Wentworth-Cermak intersection, which jogs in an offset alignment, contributes to a high number of crashes, according to a city analysis…

In Chinatown, the southern end of the new arterial road would offer access to the Dan Ryan Expressway, according to the city’s Central Area Action Plan, a list of proposals and specific projects, along with their construction timetables and estimated costs…

The city has slowly been planning improvements for more than a decade to boost safety and reduce traffic congestion in the area, especially among vehicles exiting the Ryan ramps at Cermak. In April 2008, a semitrailer truck that had just exited the Ryan barreled through a crowded intersection and slammed into the Cermak-Chinatown station, killing two people and injuring 21.

Improving a dangerous intersection, particularly in a higher-pedestrian area, would be helpful. It sounds like Wells and Wentworth could be connected between Roosevelt and 18th Street, providing another north-south route. Yet, the city’s explanation of the rationales for this change hint at another important factor:

1. Improved safety for vehicles, pedestrians and bicyclists. Within a wide study area, the offset intersection at Wentworth and Cermak had the highest number of crashes of any other intersection. In comparison, the number was almost double the number of crashes occuring at the intersection of the Dan Ryan off-ramps with Cermak. The realignment of Wentworth at Cermak is required to facilitate safer connections for all modes of traffic.

2. Construction of a new north-south collector street (Wells Wentworth) . This will allow for improved traffic flow throughout both TIF Redevelopment Areas by creating a coordinated series of intersections, as well as provide or improve pedestrian connectivity within the two project areas and to nearby destinations such as the new Ping Tom Park Fieldhouse, the proposed new Chinatown Library, the existing commercial areas, and transit stops.

3. Significant redevelopment opportunities. Improved connectivity between the Loop, the two TIF Redevelopment Areas, and the surrounding communities will promote the redevelopment of vacant land and expand economic development opportunites.

So the real reason may not be safety or providing another north-south thoroughfare to help relieve traffic. The primary reason, as it often is with urban changes, is development which means money and profits. Safety is good but safety plus new developments that bring in new money are even better. There is money to be made with a new street.

Look for glow-in-the-dark roads

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Lights along roads can cost quite a bit of money so why not use glow-in-the-dark road markings?

Light-absorbing glow-in-the-dark road markings have replaced streetlights on a 500m stretch of highway in the Netherlands…

One Netherlands news report said, “It looks like you are driving through a fairytale,” which pretty much sums up this extraordinary project. The design studio like to bring technology and design to the real world, with practical and beautiful results…

Part of that vision included weather markings — snowdrops, for instance, would appear when the temperature reached a certain level. For now though, the 500m stretch of the N329 highway in Oss features only the glow-in-the-dark road markings, created using a photo-luminescent powder integrated into the road paint, developed in conjunction with road construction company Heijmans.

Roosegaarde told Wired.co.uk Heijmans had managed to take its luminescence to the extreme — “it’s almost radioactive”, said Roosegaarde. You can get some sense of that in this embedded tweet, which appears to show three stripes of varying shades of radioactive green along both the highway’s edges.

Sounds pretty interesting, particularly if the markings can last long-term. I suggested something like this a few months ago to combat the issue of snow covering lines in parking lots.

Looking at where snow is and isn’t plowed on Philly streets reveals where public spaces could be created

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One astute observer looks at snow plow patterns on Philadelphia streets and shows how spaces where snow is not plowed could become more public space:

If you haven’t heard of a “sneckdown” yet, it’s a clever combination of “snow” and “neckdown”—another name for a curb expansion—that uses snow formations on the street to reveal the space cars don’t use. Advocates can then use these sneckdown photos to make the case to local transportation officials that traffic-calming interventions like curb bump-outs and traffic islands can be installed without any loss to car drivers.

One of the areas of Philadelphia with the best opportunities for pedestrian plazas is East Passyunk Avenue, which crosses the street grid at a diagonal, creating lots of triangular intersections. I thought the snow would provide some good examples to help you visualize what I’m talking about, so I headed over there to take some sneckdown photos. And to my delight, the snow revealed some awesome traffic calming ideas I hadn’t considered.

At the intersection of 6th and Passyunk and Christian, near the excellent Shot Tower Coffee, there is a triangular plot of land that I always thought would make a great public plaza, but there’s a “for sale” sign there now, indicating it will probably become housing.

The city’s choice to allocate the public right of way around this triangle to curb parking for cars means the parcel is smaller than it could be, but even so, the snow formation shows it could be larger even without taking away parking. Try to imagine how much more sidewalk there could be if not for the curb parking around the island though:

Very thorough. This is a clever use of observational data: snow plowing makes the point that not all space on streets and roads is regularly used by cars. How might this space be used differently if it is not required as part of the road?

I wonder how much of this has to do with standards for road construction, whether in the past or today. For example, in Suburban Nation several New Urbanists argue that most road standards today are way too wide which then encourages faster driving and limits sidewalks and public space. They also suggest that we make choices as a society about how we want roads to function: are they there to maximize vehicle efficiency and speed or are they streetscapes that can help cultivate social and civic life (which usually means toning down the emphasis on vehicles)?

Potholes can be avoided by spending more on road upkeep

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Communities can limit the number of potholes they experience each winter if they spent more money upfront on maintaining roads:

The answer doesn’t lie in a revolutionary new cement or asphalt mix — yet, experts say. Instead, it comes down to a few simple things: quality materials, experienced builders, plus regular road maintenance and reconstruction.

“A lot of things cause potholes, but at the core they’re caused because we don’t do enough road maintenance. We push our roads too far and too hard,” said engineer Don Hillebrand, head of Argonne National Laboratory’s Transportation Research Center…

Avoiding potholes starts with getting it right the first time, said Mohsen Issa, a University of Illinois at Chicago structural and materials engineering professor…

Hillebrand, a former auto executive with Chrysler and Mercedes-Benz, spent time in Germany, where “they view roads as a serious thing and spend much more on road maintenance than we do and expect them to last longer,” he said. Deeper foundations and thicker concrete help preserve German roads, he noted.

Roads seem to be the sort of thing many people don’t pay attention to until things start going wrong. However, as this article notes, roads have to be built well and continually maintained. This requires a good deal of resources that people may not want to spend until something goes wrong. Yet, when things do go wrong, fixes are not necessarily quick or easy. This provides a classic lesson in infrastructure: spending money upfront pays off down the road.

A question: just how many pothole stories can the media run this winter?

Two places for regular vehicle accidents: The Snake on Mulholland Drive, short underpass in Durham

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I ran across stories recently about two areas that experience numerous vehicle accidents. Not just a few but dozens of accidents over several years. Here they are:

1. A short underpass, eleven feet eight inches, in Durham, North Carolina takes off the tops of a number of trucks. Watch here:

Though authorities have made efforts to prevent vehicles from running into the low-ceilinged bridge – which as blinking lights and multiple signs warn, has a clearance of only 11 feet and 8 inches – the demonic structure continues to ruin the days of incautious drivers. “After a 5-month ‘dry spell,’ the Gregson St canopener got hungry again in November and December,” reports the bridge’s devoted biographer, Jürgen Henn…

Note the counter at bottom – that last collision marked at least 67 violent impacts since 2008 at this miserable crossing. As to why nobody’s fixed the wretched thing, as explained before 1) a sewer main right underneath is blocking the lowering of the road 2) the railroad company that maintains the bridge has installed a crash beam, so the problem is covered from its end 3) the city has put up signs about the low clearance as far back as three blocks, so it’s covered from its end.

2. The Snake is at one end of famous Mulholland Drive, known for its views of Los Angeles. Motorcycles, in particular, seem to have a lot of problems:

On any given Sunday, The Snake is overrun by drivers and motorcyclists. They’ve been hitting this spot 30 miles northwest of Hollywood for decades, but it became a hot destination in the 1960s when Steve McQueen started blasting through Mulholland on his Triumph. The road’s popularity grew over the years, and even an aggressive crackdown on speeding and a temporary shuttering of the road in the 1990s did little to slow the The Snake’s popularity. These days it isn’t uncommon to see celebrities like Jay Leno motoring through in six-figure cars. But it’s the motorcyclists you’ll see most often…

Bennett says Edwards Corner is not a tough one. It’s an uphill bend with a constant radius and positive camber, meaning the road’s angle is steady and the surface is tilted inward. The riders who go down tend to hit the corner way too fast, realize they’re in over their heads, fixate on the guard rail, and slam right into it. Just as often, though, riders get too greedy with the throttle on the way out, causing the rear end to slide. Beginners and squids tend to jump off the throttle or lay on the brakes, causing the bike to go wide and forge a trail into the hillside. The skilled riders come down from speed before the turn, lean in, and roll on the gas after the apex — keeping their eyes on the exit the entire time…

Snyder’s videos show exactly how, in excruciating detail. A playlist of 79 clips shows every type of rider imaginable making every type of mistake imaginable. Lowsides on Harleys, highsides on Ducatis, and the occasional car crash. But through it all, there’s an air of camaraderie, with riders helping each other pull bikes from ditches as others slow incoming traffic and even sweep up dirt and debris to prevent another crash.

I spent 20 minutes or so the other watching a number of these 79 clips. Remarkably, most of the people in the accidents were able to walk away, even in the 2013 crash where a motorcyclist hit two cyclists.

In both cases, it sounds like drivers should be well aware of the dangers. In the case of the underpass, there are plenty of signs – though it is unclear how many drivers heed signs. In the case of The Snake, it looks like there are often people standing around, indicating something to pay attention to – though this might lead to trying to show off. Perhaps officials only have two means of recourse: (1) completely rebuild these sections or (2) close these sections all together if rebuilding is not possible.

Another remarkable piece of this: there are people willing to videotape all of these crashes and then make them available online.

Considering a mileage tax at the federal level

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States have been discussing mileage taxes to fund road construction and maintenance but it is now up for discussion at the federal level:

Shuster rejected the idea of raising the nation’s 18.4 cents-per-gallon gasoline tax, now the primary method of paying for road, bridge and mass transit projects. Besides a mileage tax, he said other funding methods include higher taxes on energy exploration and bringing back corporate profits earned overseas…

A vehicle miles tax has never been considered on the federal level because of objections to the concept of tracking how many miles people drive to assess and collect the levy. There have been some state- and local-level experiments.

A partisan dispute in Congress over tax increases is clouding potential action on a long-term highway bill backed by companies including Caterpillar Inc. (CAT) It’s also heightening the risk that the U.S. will run out of money to pay for projects later this year…

Groups led by the U.S. Chamber of Commerce, the biggest business lobby, want to prevent a repeat of 2012, when proposals to fund roads, bridges and mass transit for six years sputtered over bipartisan opposition to raising the gasoline tax. The shorter-term measure, which used general tax revenue to keep highway construction going, expires Sept. 30…

Lawmakers in both parties, including Republican Senator Roy Blunt of Missouri and Democratic Senator Carl Levin of Michigan, already have said they doubt Congress can forge a consensus on the tax-financing issues and pass a bill that authorizes programs for five or six years as industry groups want.

It sounds like a conclusion is still a ways off. At the same time, there are powerful interests involved and a deadline for funding coming up. It would be interesting to see what happens if this gets instituted by the federal government before states make their own decisions. Could drivers end up getting taxed for their mileage by both Washington and their state capitals?

Driverless cars might lead to the safest roads ever seen and highways that actually work

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Google’s Sebastian Thrun discusses the safety advantages of driverless cars as well as effective highways in this video. Two quick thoughts:

1. Autonomous vehicles can help stop the wave or accordion pattern of driving where someone slowing down at the front of a line of cars backs everyone up. Thrun talks about a a much more closely coordinated zipper kind of merging where cars going basically bumper to bumper can accept new vehicles with little change.

2. Even with a dip in recent years, more than 30,000 Americans die each year in vehicles. Strun says most of this is due to driver error, which can basically be eliminated when humans no longer control the car.

All of this sounds good…

Chicago suburb of Long Grove wants to privatize almost half of its public roads

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Maintaining roads is expensive and the Chicago suburb of Long Grove has a potential solution: privatize a lot of its public roads.

Facing an annual funding gap of more than $1 million, Long Grove trustees have twice in recent months affirmed a plan that could privatize nearly half of the village’s public roads — transferring the cost of upkeep and plowing to the residents in the process…

Experts in public planning and municipal finance agree that Long Grove has hit upon an unusual potential solution to a commonplace problem. They say other communities also struggling to make ends meet could follow suit as aging roads deteriorate and revenue streams dry up. Yet such plans could eat away at the public’s trust in local leadership even as they mitigate public deficits, warned Joseph Schwieterman, a DePaul University transportation professor.

“It’s going to create resentment that city hall has broken its contract to fix the roads, and that could lead to turmoil that tears at the social capital of a community,” he said.

What has surprised some in and around well-to-do Long Grove is that the community — with its spacious home lots, ample green space and refined, rural character — finds itself in the situation at all. Recent census figures count it among the wealthiest villages in the Chicago area based on median income. Yet having more affluent residents doesn’t necessarily equate to a strong tax base, especially in towns that have little or no industry…

Local leaders first realized in the 1970s that to pay for maintaining roads without a property tax, something had to give, said Long Grove Village Manager David Lothspeich. After that, the board allowed public streets in new subdivisions only if they were main roads, and eventually entire subdivisions sprang up without a single public road, he said.

It sounds like a set of trade-offs: the community has a particular image and character involving big lots, nice homes, and no property taxes but to help maintain that character means limited commercial development. However, having less commercial or industrial development means fewer sources of property and sales taxes that can be used to maintain the community’s infrastructure. The money has to come from somewhere…

However the money is raised in the future for roads, it will be interesting to see how this affects the community’s character and image. Will people move away? Will it be as attractive?

Another suburb dealing with a similar issue is Winfield. The village has had difficulty paying for road maintenance and the debate in recent years has been whether to allow commercial development along the Roosevelt Road corridor that passes through the southern part of the community but it currently limited to larger lots.

Roads still susceptible to potholes

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A Google News search for the last week brings up hundreds of news stories about potholes. It is a familiar cycle: water gets on the roads, freezing temperatures cause the water to expand, potholes emerge on lots of roads. See diagrams and video about pothole formation here.

Is there any way to build roads that don’t have these problems? Here is one answer:

Which holds up better — concrete or asphalt? “Asphalt can sometimes be a more porous material than concrete depending on the depth of the asphalt surface. As a result, it can be more prone to a freeze-thaw cycle,” Shuftan said.

However, DuPage County Transportation Committee Chairman Don Puchalski said it’s all about maintenance. “The condition of the pavement keeps moisture from penetrating the riding surface,” Puchalski said.

Can’t we build pothole-proof roads? Engineering professor Imad Al-Qadi thinks we can do better. “Through better engineering of the materials and pavement systems, roads can withstand extreme temperatures and cycles of freezing and thawing,” Al-Qadi wrote in an email.

For asphalt, using proper binder and aggregate materials that aren’t susceptible to moisture, freezing or thawing can minimize damage.

For concrete, using the right chemical mixtures can control freezing and thawing. Proper spacing and using more steel in the concrete slabs can also control warping, Al-Qadi said.

This makes it sound like the best pothole solution might be more monitoring and money when roads are originally built. Who is going for pay for that? Surrey, England has gone with “pothole-proof” roads that have a 10 year guarantee:

But in an attempt to find a more permanent solution, the council has begun a five-year, £100 million plan to re-lay the county’s worst roads with new materials which carry a decade-long “no pothole” guarantee…

At the moment the council says it is carrying out a pothole repair every five minutes but the new roads, which have more flexible watertight surfaces, should overcome the problem…

About 300 miles of road will be repaired and the 10-year warranty means any potholes would be repaired by contractors Aggregate Industries and Marshalls.

So there might still be potholes but at least the road-builder will take care of it.

If the roads always have this problem, you could instead with a car that stands up better to potholes:

Honda cars are the most resilient to pothole damage, saving drivers hundreds of pounds in repairs each year, according to research by Potholes.co.uk.

The road maintenance campaign website analysed about 150,000 policies issued by Warranty Direct over three years to reveal the cars most and least susceptible to damage caused by the nation’s biggest bugbear – potholes…

After Honda, the most “pothole-proof” manufacturers are Toyota and Hyundai, with less than two per cent of their cars suffering axle and suspension damage attributable to potholes and other road defects.

Chrysler, Mercedes-Benz and Land Rover models are the most likely to suffer, with more than 10 per cent suffering damage each year.

Or you can just pay for some pothole-resistant tires.

All together, this is an annoying reminder that maintaining roads can be quite difficult. If they all have problems, it is very difficult to fix them quickly.

Watch out for the “stroad,” the bad street/road hybrid

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A former street engineer provides warnings about the “stroad” and the havoc it wreaks on the landscape:

“The STROAD design — a street/road hybrid — is the futon of transportation alternatives. Where a futon is a piece of furniture that serves both as an uncomfortable couch and an uncomfortable bed, a STROAD moves cars at speeds too slow to get around efficiently but too fast to support productive private sector investment. The result is an expensive highway and a declining tax base.”

Marohn says he coined the term in 2011 to wake up the people who design America’s roads. “I really was writing it as a way to push back at the engineering profession and get my fellow engineers to think about the bizarre things they’re building,” says Marohn. That was why he initially wrote the word in that annoying all-cap style, which he eventually dropped. “I figured engineers would read it and wonder, what was it an acronym for?” he says, laughing.

While Marohn came up with the neologism partly in a spirit of fun, he considers stroads a deadly serious problem. Not only are they dangerous and aesthetically repugnant, he argues that they are economically destructive as well. They don’t provide the swift, efficient mobility that is the greatest economic benefit of a good road, and they simultaneously fail to deliver the enduring value of a good street — which fosters community, good architecture, and financial resilience at the lowest possible cost…

Instead, stroads create hideous, inefficient, and disposable environments that quickly lose value.

These are many of the four to six-lane commercial thoroughfares that dominate American cities, at least the less dense parts, and suburbs. These roads are lined fast food restaurants, big box stores, car dealers, gas stations, offices, and big signs that try to catch your attention as you drive by. One twist that I like here is the suggestion that this is not necessarily good for cars either because of all the traffic lights and congestion.

Two places where I have seen depictions of such stroads:

1. I recently showed the documentary Jesus Camp in class and the film features several scenes of such roads. The roads don’t look very attractive – lots of cars and signs – and they are sort of stand-ins for everyday Americana. It is one thing to see it in a film and another to realize that you drive past this every day. But, as the film suggests, America is filled with these scenes and they all kind of look similar.

2. James Howard Kuntsler, a well-known critic of sprawl, makes a note of such roads. In different contexts, he points out the absurdity of trying to be a pedestrian on such a road that is clearly meant for cars (imagine crossing all those lanes at a traffic light or walking through all of the drives in and out of business) as well as the trivial amount of “nature” that planners try to add in to make it all look better. All together, these roads just encourage sprawl.

What is the alternative to this? In a perfect world, perhaps it is connecting denser downtowns and neighborhoods with pedestrian friendly streets (nodes) with a system of faster roads or mass transit (connections between the nodes).