Category: Neighborhoods

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. 

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.

Be your own traffic and road planner

October 16, 2012 / / 0 Comments

Wanna know how many cars were measured to pass by on a street near you (in Chicago)?

Want to know how wide a street is?
Want to do this without leaving your house?

You can.

1. Find the “ADT” (average daily traffic) for roads in Chicago on the city’s Traffic Tracker website. Average is a misnomer, though, because that implies more than one count has been taken or estimate has been made. The last time the city counted cars in Chicago was 2006; I imagine the difference in counts taken this year would be statistically significant (meaning any differences would not be by chance or random).

To find a location in Traffic Tracker:

  1. You can pan and zoom the map until you find it, or you can select one street and then select an intersection street and click the magnifying glass.
  2. Then click the checkbox next to Traffic Signals.
  3. Click on a green dot (with number label) to find direction counts and the count date.

Okay, now let’s measure the street width.

Google Earth and Maps have this tool. For Google Earth, it’s as simple as finding the ruler tool in the toolbar, selecting your units, and then clicking on the start and end points. The distance will also be displayed live as you move your cursor.

Finding the distance in Google Maps has a few more steps:

  1. Turn on the measurement tool, in Maps Labs. Go to Google Maps and click “Maps Labs” at the bottom of the left pane.
  2. In the popup dialog pane, click the radio button next to “Enable” for Distance Measurement Tool.
  3. Click Save Changes.
  4. Find the street you want to measure.
  5. Click the ruler button in the lower left corner of the map.
  6. Click one side of the street and then click the other side of the street. You can keep clicking to get distances of a polyline (a multi-segmented line) that you draw.
  7. Change the map units to your desire (there are tens of archaic ones available).

Now you’ve got two more tools with which to arm yourself in understanding your streets and your neighborhood.

Pride Parade 2012: Easier on transportation system over last year

June 28, 2012 / / 0 Comments

Bodhi Spiritual Center says, “You are fabulous”. 

After last year’s near-meltown of transportation surrounding post-parade trips, parade organizers, aldermen, and the city redesigns the parade route, to make it longer and eliminate the hard to access “internal triangle” between Halsted and Broadway (with a vertex at Grace/Halsted/Broadway). The meltdown was that thousands of people tried to board at the CTA Belmont Station. The station stopped allowing new passengers 5 times to ease overcrowding. I can’t recall if trains had to skip the station because they were full.

The new design allowed for better access from more CTA train stations, more bus routes, and allowed for more even spectator dispersal along the route (with 6 pedestrian crossings operated by many police officers). The CTA, which is usually very good at communicating service changes, made a webpage dedicated to the Pride Parade and even designed their own map. That and their social media communication stressed the other stations paradeogers should use: Wilson, Sheridan, Addison, and Fullerton. That was in addition to the other bus routes that now had closer access to the changed route.

I wrote about the 2011 transportation experience on Grid Chicago in which I suggested shutting down private vehicle traffic on more streets and further away from the parade route, allowing only buses and bicyclists. I couldn’t tell if that happened this year. Last year I entered the parade “shed” on Belmont and then Addison. All east-west streets it seemed were closed to traffic from Clark Street to Halsted Street (which is a good thing). Clark Street was closed this year for a couple of blocks south of Diversey Avenue (also a good thing).

Chicago Fire Department miniature trucks. 

I didn’t notice these last year, but the fire department utilized ATV-like trucks to transport sick spectators. I didn’t see any Chicago police officers riding ATVs, but I may have read the department abandoned those because of their increased danger on crowds and the officer driving it.

I think the route changes were effective in making for a better (and safer) parade experience. Organizers and the City’s OEMC estimated attendance at 850,000, just 50,000 over last year. Because of the changes and the great weather (it was very breezy), I expected a higher increase. Some people who attended last year may have been turned off by the unease of the crowded viewing experience.