Category: Roadways

photo of Hadiya Pendleton Park, seen from the 43rd Green Line station platform.

Traffic calming around Chicago schools and parks

July 26, 2023 / / 0 Comments

Reducing the number and speed of automobiles near schools and parks is a proven way to reduce the number of traffic crashes involving children, part of a practice known as “traffic calming”. In Chicago a key way to do that has been to “cul-de-sac” (which I’m using as a verb) a street to prevent through traffic (reducing the number) and preventing speeding (reducing the speed).

My study of this was inspired by the above tweet, where the person is accurate when they say, “it works with any street”. Indeed: Full access to the school or park and to every property on the block is maintained, but drivers are not able to go through while pedestrians and bicyclists can (another practice called “modal filtering“).

My favorite example in Chicago is Hadiya Pendleton Park, at 4345 S Calumet Ave. This project created two mid-block cul-de-sacs and a park in the middle of a block, using vacant city-owned land on both sides. Creating new open space is a common corresponding outcome of the cul-de-sac application, which is what occurred at Funston Elementary School (see the before and after aerial photos below).

two black and white aerial photos taken of Funston Elementary School, one in 1998 showing a 4-way intersection of McLean Ave and Central Park Ave and one in 2003 showing a cul-de-sac on McLean Ave west of the school and landscaped area between the cul-de-sac and the three-way intersection of McLean and Central Park.

Through Twitter I solicited additional examples of where the city has created traffic calming near schools and parks using cul-de-sacs. Examples were submitted by Roland, Emily (who mentioned Funston), Matt, Steven, and another tweeter.

Using OpenStreetMap, Overpass Query Language, and Overpass Turbo, we can find all of the schools and parks that are within a specified distance of a cul-de-sac. It turns out there are 153 schools and parks in Chicago that are within 150 feet of a cul-de-sac. (This considers only schools, parks, and cul-de-sacs, tagged as “turning circles”, currently mapped in OSM, and I have not verified each of the 153 instances.)

Map showing parks, schools, and adjacent cul-de-sacs, the results of the Overpass Turbo query.
Map showing parks, schools, and adjacent cul-de-sacs, the results of the Overpass Turbo query. An inset map shows a zoomed in portion of the map to illustrate the different types of features captured in the Overpass Turbo query (specifically it shows Graham Elementary School and McInerney Park).

The query below will find all of the cul-de-sacs (mapped as “turning circles” in OSM parlance) that are in Chicago, all of the schools and parks in Chicago, and then all of the two categories of features that are within 45 meters of each other. (Run the query and show the map, which will always grab the latest data.)

/*
example from OSM wiki: https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_API_by_Example
*/
[out:json][timeout:25];
// fetch area “Chicago” to search in
{{geocodeArea:Chicago}}->.searchArea;

// get cul-de-sacs
(
  node["highway"="turning_circle"](area.searchArea);
)->.turning_circles;

// get parks and schools
(
  way["amenity"="school"](area.searchArea);
  way["leisure"="park"](area.searchArea);
)->.schoolsParks;

// find parks and schools near cul-de-sacs
(
  way.schoolsParks(around.turning_circles:45);
)->.matchingSchoolsParks;

// find cul-de-sacs near parks and schools
(
  node.turning_circles(around.schoolsParks:45);
)->.matchingTurningCircles;

// output results to the map
(.matchingSchoolsParks; .matchingTurningCircles;);
out geom;

Read the three other blog posts I’ve written about using Overpass Turbo to quickly sift through and extract desired mapping data from OpenStreetMap.

A short list of features of the Netherlands that I still try to wrap my head around

January 18, 2023 / / 0 Comments

The Netherlands is the country I’ve visited the most, going there eight times between 2011 and 2022. I’ve obsessively visited 31 cities, the Hoge Veluwe national park, and plenty of other places outside cities.

Here are three land use and infrastructure characteristics that continue to fascinate me.

Transportation systems, obviously

Learning about how the Dutch created the safest network of streets for cycling is what started my near-obsession 15 years ago.

Then I went there in 2011 and I got to experience it for myself (photos from that trip).

I think the quality, capacity, likability, and integration of their transportation systems can be summarized best, for Americans who haven’t been there, by learning the results of a Waze survey: People who primarily drive in the Netherlands are more satisfied with the driving in their country than people in other countries are with driving in theirs.

In other words…if you like driving, then you should also care about what the Netherlands because they happened to also create the most driver-friendly transportation system.

Creating land & living with flooded land

As a novice, it’s probably easier to notice and understand how the Dutch create, move, and live with flooded land from above. There have been moments while I was cycling in the country where I’ve ridden past “polders” and former lakes and seas only to realize it later that I had biked through a massively transformed area that appeared entirely natural.

When I lived in Rotterdam for three months in 2016 I tried to visit as many places across the country as I could. I especially wanted to visit Flevopolder, the larger part of the Flevoland province, built from of the sea in 1986 where 317,000 people live.

I visited both major cities on the Flevopolder in the same day, Almere and Lelystad, the capital. I cycled from Almere (photos) to the seafront of Markermeer, and…get this…had to ride uphill because the land is below sea level.

Reaching the edge of Flevopolder, where it borders the sea called Markermeer
Cycling uphill to meet the sea north of the city of Almere, in the Flevoland province of the Netherlands.

Most Dutchies live below sea level, and the country has massive land and metal engineering works to keep the water in check.

The Dutch, especially in and around Rotterdam, come up with new ways to deal with water and export this knowledge abroad.

While the existing and planned measures should be sufficient until at least 2070, too much uncertainty over the progress of climate change remains afterwards to assess whether the city will truly stay liveable.

Some assessments suggest that if the sea rises by 5m – an estimate in sight within a century, considering the unpredictability of the rate that Greenland and Antarctica’s glacier will melt – Rotterdam will have no other choice but to relocate.

“Rotterdam: A bastion against rising sea, for now”
By Zuza Nazaruk

The country may rely on electricity to survive more than most: it’s needed to keep the pumps working, to keep the water in the sea instead of in and over the land.

How productive their agriculture industry is

By land area, the Netherlands is a very small country; it would be the tenth smallest state in the United States. By population, it would be the fifth largest state (17.6 million, greater than Pennsylvania’s 13 million).

Given that, how is it that the Netherlands is the world’s second largest exporter of agricultural products by value, after the United States?

Simple answer: High-quality, high-value, high-demand foodstuffs; space-efficient farming practices, including a significant amount of food grown vertically and in greenhouses. And, I don’t remember if this was in the article, very good transport connections to trading partners through seaports, canals, railways, and motorways.

I was surprised to see that both brands of canned cold brew coffee sold at the convenience store in my apartment building are produced in the Netherlands.

To slow down drivers, we must speak up to our own drivers

November 20, 2016 / / 0 Comments

Backseat view of drive to Oak Park

We have a lot of power from the backseat to influence our drivers to drive better. We only have to speak up.  Photo: John Bracken

I’ve had a lot of experience with a major “transportation network company” this weekend. TNCs are also known as e-hail car services, and, inaccurately, “ride share”, because a car arrives at your location after pressing a button on an app.

I rode in one four times from Friday to Sunday because my visiting friend had a broken bone and couldn’t ride a bike – that was our original plan. Instead we had a multi-modal weekend and relied on walking, public transportation, another friend’s personal vehicle, and the TNC to go out.

These experiences reminded me that advocates for safe streets and better active transportation service and infrastructure – including myself – must directly battle entrenched norms about the “plight of the driver”.

In our final ride, on our way to the airport to drop off my friend, the TNC driver asked about the timing of our trip, if we were in a rush so the driver could know if they needed to drive a certain way.

I said that we were not, that we had budgeted plenty of time, and that Google Maps showed green lines on the local streets and highway between where we had dinner in Ukrainian Village and O’Hare airport.

As he was driving the car northbound on Western Avenue toward the Fullerton Avenue on-ramp to the Kennedy, my friend asked him about the app he was using that was speaking the turn-by-turn directions, and how it knew what the road conditions were.

The app uses the Waze service, which collects data from transportation departments, other drivers, and databases of upcoming road closures. The driver said he liked that it warned him of the locations of red light and speed cameras, too.

“I’ve gotten four speed camera tickets in the last year”, he said, “and they were all $100 each.”

I have written about Chicago’s speed cameras several times in Streetsblog Chicago, and I thought the cost was different so I asked, “Isn’t it lower for the first time?” Nope, he said.

When I looked it up at home I remembered why I was mistaken: The fine is $100 if you are traveling 11 miles per hour or more over the speed limit. The fine is $35 for traveling six to 10 miles per hour or more over the speed limit, but the cameras aren’t enforcing this range currently.

That was the end of our conversation, but I should have kept on.

The conversation we should have had would have questioned his driving behavior. I should have asked, “Why are you driving so far so often?” and “Why aren’t you slowing down? Don’t you know that speeding is dangerous to you, your passengers, and other people outside the car?”

I was spineless and didn’t challenge how he was contributing to unsafe streets in the city. My silence was tacit agreement that four $100 speeding tickets – for driving 41+ in a 30, or 31+ in a 20 in a school zone if a child was present – was a personal burden and not a necessary enforcement tool to try and reduce the number of injuries and deaths in car crashes in Chicago.

Later, on the Kennedy Expressway, he was traveling a bit over 70 miles per hour, or more than 25 miles per hour greater than the speed limit. Again I said nothing.

Another of the TNC drivers this weekend was likely high on marijuana. I shouldn’t have accepted any of these situations.

Chicago has too many traffic signals

June 21, 2016 / / 7 Comments

IMG_2496

People wait at a stop light on the first major ring road in the city center of Amsterdam. Photo: Northeastern University, Boston

I was flabbergasted to learn today that there are only 5,500 signalized intersections in all of the Netherlands. I was reading Mark’s blog “Bicycle Dutch” and he interviewed a city traffic signal engineer in Den Bosch, who described how different road users are prioritized at different times based on the complex programming. (Watch the video below.)

In Chicago there are more than 3,000 signalized intersections. And I believe this is way more than we need.

I understand more than the average person how traffic moves in each place and how it “works”. There is such a thing as too many traffic signals because at some point the signals (their proximity and their programming) start causing delays and conflicts.

Saying that traffic – of all kinds, bikes, trucks, buses, delivery vans, and personal vehicles – moves better in cities in the Netherlands than in Chicago is an understatement.

Aside from their impacts on traffic (which can be good in some situations, but aggravating existing problems in other places), signals are very expensive to purchase, install, and maintain.

In Chicago, an alderman (city councilor) can use part of their $1.3 million “menu” money annual allocation to purchase a traffic signal for $300,000. That’s money that won’t be used for transportation investments that reduce the number of severe traffic crashes as well as reduce congestion like bus lanes and protected bike lanes.

Let’s review

I compared their populations (about 17 million in the Netherlands and 2.7 million in Chicago) and saw that Chicago has a lot more traffic signals per person.

On Twitter, however, I was challenged to find the number of traffic signals per mile driven, not per capita.

So, I did, and I was surprised by the result.

This assumes I collected the right statistics, and converted the driving figures correctly.

The surprise: There are more passenger miles driven (known as VMT) in the Netherlands, per capita, than in Chicago. I actually can’t even get passenger miles driving in Chicago – I can only find “all miles” driven. And that includes trips on interstates that pass through Chicago but where the driver or passengers don’t stop in Chicago.

Here’s the analysis, though.

Driving

  • According to the OECD, there were 145,400 million kilometers driven on roads, for passenger transport, excluding bus coaches, in the Netherlands in 2013 (the latest year for which data was available in the Netherlands). That’s 145.4 billion kilometers. (Source, no permalink.)
  • According to the Illinois Department of Transportation, there were 11,150,109 thousand miles for all kinds of road transport, in Chicago in 2013. That’s 11.2 billion miles, which converts to 17.9 billion kilometers. (Source)

Population

  • In 2013, the Netherlands had 16,804,430 inhabitants (they had declared reaching 17,000,000 this year), according to the OECD.
  • In 2013, the City of Chicago had 2,706,101 inhabitants, according to the U.S. Census Bureau’s 2009-2013 ACS 5-year estimate.

Signals

Results!

  • The Netherlands has over 39 signalized intersections per billion kilometers traveled.
  • Chicago has over 167 signalized intersections per billion kilometers traveled.

There are many kinds of shared space

May 29, 2016 / / 0 Comments

A guy standing in the middle of the intersection

I took this photo outside the café Memory Lane in Rotterdam because the man in the white shirt was standing in the “middle” of this intersection for a couple of minutes. Before he took this position, he was walking slowly across the intersection to the opposite corner as his car. He’s a livery driver, and he appeared to be waiting for his passenger.

This intersection is raised (the sidewalk is level with the road surface), and is uncontrolled (there are no traffic signals, stop signs, or yield signs). A bicyclist or motorist can pass through this intersection without having to stop unless someone is walking, or a bike or car is coming from their right.

This junction has no crosswalks, either. And no one honks. Especially not at the man who’s in the roadway.

Because he’s not in the roadway. He’s in a street, and streets are different. Streets are places for gathering, socializing, eating, connecting, traveling, and shopping. There was plenty of space for him to stand here, and for everyone else – including other motorists who were in their cars – to go about their business.