Category: Places and Spaces

Revealing driver behavior on Clark Street with a radar gun

July 30, 2013 / / 2 Comments

People prefer to cross Clark Street at Menomenee Street in groups of unacquainted individuals.

This is a more detailed post of the one at Streetsblog Chicago.

On the overcast morning of Friday, May 4, 2012, I recorded the speeds of 412 cars at four locations along Clark Street in Old Town and Lincoln Park for 15 minutes at each location. I missed counting the speeds of 42 cars. The embedded map shows the locations and some basic statistics.

What did I find? There’s a relationship between street width and the speed people drive. The highest speeds were found on the widest portions, and the lowest speeds on the narrowest portions. However, this basic study is far from scientific. A better study would record the locations simultaneously (necessitating 4 radar guns), calibrated equipment, consistent training for the researchers on data collection methods, a longer recording duration, and comparison to a control street that had a uniform width at four locations.


View Radar gun places on Clark Street in a larger map

1. Southbound Clark Street at Germania Place

My assistant and I set up the radar gun and camera immediately south of Sandburg Terrace and pointed the radar gun at people driving southbound on Clark Street between a row of parked cars at the concrete median (pedestrian refuge island). Classes would start soon at the Latin School on the east side of Clark Street. Compliance with state law requiring drivers to stop for pedestrians in the crosswalk was weak, to say the least, but compliance wasn’t explicitly measured.

  • Average speed: 17.21 miles per hour (MPH)
  • Maximum speed: 30 MPH
  • Cars measured: 151
  • Speed limit: 30 MPH
  • Drivers exceeding the speed limit: 0
  • Width: 224 inches (from west curb to pedestrian refuge island)
  • Effective width: 140 inches (excludes parking by subtracting 7 feet)
  • Crashes: 35, of which 4 were bicycle, and 3 were pedestrian.

Only one car-car crash (actually a 3 car crash) produced an injury. What’s interesting about this location is that in a lot of the crashes, the cars were traveling in the same direction. There’s a lot of school drop off and pick up activity here for Latin School of Chicago students, so it could be that many people are pulling away from the curb to merge into traffic and collide.

2. Northbound Clark Street at Menomenee Street

  • Average speed: 30.83 miles per hour (MPH)
  • Maximum speed: 50 MPH
  • Cars measured: 121
  • Speed limit: 30 MPH
  • Drivers exceeding the speed limit: 53.72%
  • Width: 395 inches (from east curb to dividing line). This includes the parking lane but no cars were parked within 50 feet, north and south, of the measurement location.
  • Crashes: 20, of which 2 were bicycle, and 1 were pedestrian. Many of the non-bike and non-ped crashes involved a parked car or taxi. The only injuries experienced were by the 2 cyclists and 1 pedestrian.

3. Northbound Clark Street at Lincoln Park West

We stood on the “pie” (traffic island) that separates northbound Clark Street traffic from northbound Lincoln Park West traffic to measure the traffic driving on Clark Street between the pie and the concrete median separating it from southbound Clark Street.

  • Average speed: 25.60 miles per hour (MPH)
  • Maximum speed: 40 MPH
  • Cars measured: 58
  • Speed limit: 30 MPH
  • Drivers exceeding the speed limit: 27.59%
  • Width: 252 inches (from concrete median curb to west curb on the pie)
  • Crashes: 4, of which 1 was bicycle, and 2 were pedestrian.

4. Northbound Clark Street between Lincoln Park West and Dickens Avenue

This location is 125 feet north of the previous location.

  • Average speed: 22.54 miles per hour (MPH)
  • Maximum speed: 35 MPH
  • Cars measured: 58
  • Speed limit: 30 MPH
  • Drivers exceeding the speed limit: 2.44%
  • Width: 264 inches (from east curb to dividing line).
  • Effective width: 180 inches (excludes parking by subtracting 7 feet)
  • Crashes: 0

Me measuring speeding drivers on Clark Street with the speed gun, my clipboard and paper, and a GoPro camera to record the speeding drivers and the results on the speed gun. 

Bike Walk Lincoln Park’s proposal

In 2011, Michelle Stenzel and Michael of Bike Walk Lincoln Park published a document to “Make Clark a Liveable Street“. The first two pages show an aerial photo of the same section of Clark Street where I measured automobile speeds, North Avenue and Armitage Avenue. On the first page, existing conditions are laid out. The second graphic shows proposed improvements.

At Menomonee Street, measurement location 2, the document says “pedestrians must cross 6 lanes with no safe haven”, a width of just under 66 feet. In the later pages, the first existing condition is blatant: “Wide lanes of auto traffic moving at speeds in excess of the speed limit”. My analysis in May demonstrates this.

How does BikeWalk Lincoln Park propose to “transform this stretch from a car-oriented ‘super-highway’ to a people-oriented liveable street”? By installing protected bike lanes, putting the street on a diet, and installing new and well-marked crosswalks among other ideas.

Width and speed summary

Ordered by location:

  1. 224/140 inches. 0% of drivers exceeded 30 MPH speed limit
  2. 395/395 inches. 53.72% of drivers exceeded 30 MPH speed limit
  3. 252/252 inches. 27.59% of drivers exceeded 30 MPH speed limit
  4. 264/180 inches. 2.44% of drivers exceeded 30 MPH speed limit

Ordered from narrowest to widest to see how width relates to speed:

  • 224/140 inches. 0% of drivers exceeded 30 MPH speed limit
  • 264/180 inches. 2.44% of drivers exceeded 30 MPH speed limit
  • 252/252 inches. 27.59% of drivers exceeded 30 MPH speed limit
  • 395/395 inches. 53.72% of drivers exceeded 30 MPH speed limit

Notes

Crash data is within 100 feet to avoid the overlap of the final two locations, which were 125 feet apart. Crash data comes from the Illinois Department of Transportation for 2005-2010. The Bushnell Velocity Speed Gun was borrowed for this analysis. The radar gun was filmed to show a speeding car and its speed simultaneously. The video below shows a driver traveling at 50 MPH in a Children’s Safety Zone (as it’s within 1/8 mile of a park, Lincoln Park, making it eligible for automated speed enforcement).

Curiously, no traffic counts have been collected on Clark Street near any of the count locations.

View the video on Vimeo.

Screenshot of traffic count website. Go to the Traffic Count Database System and search for “1700 N Clark Street, Chicago, IL” in the map. 

Tell me I’m wrong with my Parking Meter Deal Part Deux calculations

April 30, 2013 / / 16 Comments

A parking meter in Milwaukee, Wisconsin, displays the word “fail”. Photo by Jeramey Jannene.

I want nothing more than to believe Mayor Rahm Emanuel has created a good deal but I believe his own parking meter deal is just as ridiculous as the deal – from Richard M. Daley and 45 aldermen – that preceded it.

Rahm’s deal changes none of what Chicagoans abhor about the current deal, which include:

  • It scheduled many price increases, without offering the buyer, those who pay to park, any additional value. Value could come in the form of a parking benefit district, where the revenues pay for local infrastructure improvements.
  • The city gets none of the revenue (it collects fines, though).
  • It costs us more than we ever expected (disabled parking placard, reimbursement for street closures, road work, and festivals).
  • It removes control from the city administration and aldermen over our streets. Thanks goes to Active Transportation Alliance for pointing this out in their excellent June 2009 original report (since retracted and revised) in which the organization said, “As a result [of the lease], planners and neighborhoods have lost control over one of their most powerful urban planning and revenue generating tools.”

It changes nothing that policy makers dislike about it:

  • We can’t implement dynamic or market or congestion pricing, unless the revenues for CPM stayed the same or were increased (although this would have to be negotiated).
  • It throws another cog into the city’s plans to expand bike lane mileage. We’re already having a difficult time with merchants not wanting to lose parking in front of their store, despite all the evidence pointing to bike lanes increasing revenues. To make way for a bike lane, the metered parking space has to be moved to an equally valuable spot within the same Parking Region. The alderman has to get involved and it’s not an easy process.

Rahm’s deal, which the city council must approve as an ordinance, doesn’t help Rahm’s priorities.

The Active Transportation Alliance report said, “This lease agreement [from 2009] compromised the city’s ability to adjust parking policy; because of the agreement terms, meters will be the primary consideration in the planning of our city streets. Everything else, from traffic flow to pedestrian, bicycle and transit facilities may only be considered after meters and their corresponding income has been considered.”

Rahm’s new deal doesn’t change that, but in fact will likely give CPM the same or more revenues under the plan. It will reduce the chargeable hours by 12 hours on one day (the newly free Sunday) and increase by 1 hour at more valuable times (weekday and weekend evenings) in areas that charge $2 and $4 per hour, and is increased by 3 hours at the same times in areas that charge $6.50 per hour. I’ve attempted to estimate how much more revenue with the spreadsheet below.

The city isn’t saving $1 billion – it hasn’t spent that money and there was no surety that it would; the press release acknowledges this, calling them ” estimated future charges”. The point here is that CPM and the city have agreed on how things like street closures and disabled parking placards will be paid for (by the city). CPM isn’t going to agree to any deal that reduces the value of the company to its shareholders.

No one asked to have free parking on Sunday. No one asked to have free parking on any day. Sunday is the day when people drive the least! If anyone deserves a break, it shouldn’t go to a small segment of the popular (“Sunday churchgoers”, Rahm said, acting as if they’re being harmed, and excluding churchgoers who don’t attend on Sundays), but to everyone who had to pay more than the parking space was worth and anyone who couldn’t get a bike lane in while people are being doored left and right.

Why else is free parking a bad idea? The experts at Active Transportation Alliance wrote:

Underpriced curb parking is a hidden source of traffic congestion and stimulates the most inefficient form of urban transportation. Underpriced parking encourages drivers to cruise for cheap parking, which harms everyone’s health and safety, slows down automobiles and buses behind the cruiser, and provides little benefit to the cruiser. It is a danger to bicyclists and pedestrians because cruisers focus on finding the right spot, not on whether a pedestrian is crossing the street.

It’s this last point, the lack of focus on anything but the parking spot, that is believed to be the cause of a cyclist being severely injured last week on Milwaukee Avenue.

Just like Daley, Rahm didn’t consult the one alderman whose ward might be affected most (it’s unknown if any aldermen were consulted). If this trend of the current city council being the most “rubber stamping” in all time (by my favorite local blogger Whet Moser), I predict it’ll be passed.

Calculations

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Since the number of spaces doesn’t change between the old and new scenarios, there is no need to calculate the total $ per space per region. Revenue estimate assumes the space is always occupied. In the new scenario, proposed by Rahm Emanuel and CPM, all spaces not in neighborhoods have become slightly more valuable, enough to more than make up for the reduced value of spaces in neighborhoods.

Updated May 3, 2013, 15:51 to add a link to the current version of Active Transportation Alliance’s parking meter report and to say that it replaced the original report. 

Destination streets are rarely the best places to bike

January 29, 2013 / / 22 Comments

This family took to riding on the sidewalk of Division Street instead of in the bike lane. They’re riding the stylish workhorse WorkCycles Fr8. Once I saw them riding the blue one, I had to get a different color. 

My friend Calvin Brown, a circumstantial urban planner, is always giving me Jane Jacobs-style observations about how citizens use their cities.

“Destination streets are the ones I avoid biking on because there’s so much car traffic there. Traffic must be balanced between streets that are good for biking and ones that aren’t currently good.”

In other words, because it’s a destination street (a place where there are a lot of retail outlets, venues, points of interest) it induces a lot of car traffic. Lots of car traffic discourages people from riding bikes, and makes it difficult for those who already are.

To me, a great example of this is Division Street. There’s a bike lane there from Ashland to California Avenues, and has tons (tons!) of restaurants and some night clubs. Yet that causes a lot of taxi traffic, people driving their own cars, looking for parking, jutting into the bike lane to see why traffic is going slow or backed up (um, because there are ton of cars!), and valet and delivery drivers blocking the bike lane.

It’s exactly this traffic, though, that keeps these places vibrant, desirable, and healthy (from an economic standpoint). The solution for bicycling is easy: swap the car parking with the bike lane so that bicycling isn’t affected by a majority of the aforementioned traffic maneuvers.

Calvin’s “destination streets” examples were Grand Avenue and Chicago Avenue. Neither has bike lanes, and both have 2 travel lanes in each direction. Grand has destinations from Racine Avenue to Ashland Avenue and Chicago has destinations from Ada Street to Western Avenue. I’d wager that if you narrowed those roadways by installing a protected bike lane you’d get slower traffic and higher business receipts.

Chicago Avenue at Hoyne Avenue is a particularly stupid part of Chicago Avenue: The Chicago Department of Transportation installed a pedestrian refuge island here. After several years and at least 4 replaced signs due to collisions of automobiles with it, the design hasn’t been modified. The island in and of itself did not change the speed of those who drive here, as the roadway’s width remained static.

What abysmal pavement quality on a brand new bike lane means

January 4, 2013 / / 16 Comments

Approaching the intersection and bike lane minefield. 

I find it very embarrassing that Chicagoans are supposed to ride their bicycles in this. I feel embarrassed riding my bike in this. I rode my bike on this pavement of abysmal quality and then felt ashamed and uncomfortable that I exited the bike lane and rode elsewhere.

The bike symbol succumbs to flooding which occupies half the bike lane’s width. 

I felt like a person in a wheelchair given an “accessible” theater seat behind a column that blocks a majority of my view of the stage. I felt like I was a reporter at a newspaper given a new computer where the keyboard was missing 42 keys. The bike lane was unusable, I was the butt of a cruel joke. This felt like a pittance, throwing crumbs to the masses.

2013 April Fool’s Day came early, in fall 2012. 

The photos in this post show a bike lane in Douglas Park against the curb, with a painted buffer, running in a minefield of patches and potholes on asphalt pavement. The bike lane was installed in the fall of 2012, as part of Mayor Emanuel’s efforts to construct 100 miles of protected bike lanes. The goal has since been reduced after the definition of a protected bike lane was surreptitiously changed. The change was revealed by Grid Chicago.

You can find this at the intersection of Sacramento Boulevard and Douglas Boulevard in Lawndale on the Near Southwest Side of Chicago. View more photos of this and the other West Side Boulevards bike lanes on my Flickr. They’ve probably been the most controversial: there were complaints because of ticketing cars parked in the under construction bike lane on Marshall Boulevard; then there were complaints about the “decreased safety” of the protected bike lane on Independence Boulevard which has prompted CDOT to agree to remove it and replace it with a buffered bike lane. The Independence Boulevard debacle started because of ticketing cars parked in the under construction bike lane – I doubt it would have become an issue if cars weren’t ticketed.

Franklin Boulevard at Kedzie Avenue, taken on the same day. Thankfully it’s wide enough that you can bike around it while still being in the bike lane. 

Mapping guns in your town: is that okay?

December 25, 2012 / / 6 Comments

This screenshot shows the pistol permit holders in Westchester County, New York. The highest density of permit holders appears to be at the border with Bronx County, also known as the northern edge of New York City. 

An ABC News story I read through the Yahoo! News website tells about The Journal News, covering Westchester (Yonkers, New Rochelle) and Rockland (New City, Pomona) counties in New York, posting the names and addresses, on a map, of gun permit owners. The map contains:

…the addresses of all pistol permit holders in Westchester and Rockland counties. Each dot represents an individual permit holder licensed to own a handgun — a pistol or revolver. The data does not include owners of long guns — rifles or shotguns — which can be purchased without a permit. Being included in this map does not mean the individual at a specific location owns a weapon, just that they are licensed to do so. [Notice that some dots are outside the county.]

This article is interesting to me for two reasons:

1. The article has hyperlinks to the (alleged?) Facebook profiles of two people who commented on The Journal News’s website. I predict this will only become more common. I don’t have a Facebook profile to link to.

2. The rationale to make a map seems reasonable: so people know where there are potentially guns in their neighborhood. It seems reasonable that people want to know where there are potential sources of danger and harm near them.

The names and addresses were obtained through “routine” (their words, not mine, but it is pretty routine and normal) Freedom of Information Act (FOIA) requests. The quantity and types of guns are not considered to be public record, although this may not be true, according to the ABC News article.