Study maps pedestrian crosswalks across entire cities, helping improve road safety, increase walkability

As pedestrian fatalities in the US attain a 40-year excessive, a novel method to measuring crosswalk lengths throughout total cities may present city planners with essential information to enhance security interventions.

NYU Tandon College of Engineering researchers Marcel Moran and Debra F. Laefer published the primary complete, city-wide evaluation of crosswalk distances within the Journal of the American Planning Affiliation. Moran is an City Science College Fellow on the Middle for City Science + Progress (CUSP), and Laefer is a Professor of Civil and City Engineering and CUSP college member.

“Usually, a number of vital information associated to cities’ pedestrian realm is analog (so it exists solely in previous diagrams and isn’t machine readable), will not be complete, or each,” stated lead writer Moran, highlighting the hole this examine fills.

“We all know that longer crosswalks pose elevated security dangers to pedestrians, however hardly ever are cities sitting on up-to-date, complete information about their very own crosswalks. So even answering the query, ‘What are the 100 longest crossings in our metropolis?’ will not be straightforward. We need to change that.”

This examine’s distinctive contribution lies in its scale and methodology, doubtlessly offering a strong new software for metropolis planners to determine and deal with high-risk areas.

The staff analyzed almost 49,000 crossings in three various cities: a European metropolis (Paris), a dense American metropolis (San Francisco), and a less-dense, extra car-centric American metropolis (Irvine). To perform this, they employed a mix of knowledge sources and methods.

“We mixed crosswalk distance measurements from two totally different datasets,” Laefer stated. “The primary is from OpenStreetMap, which comes from a group of customers who’ve crowdsourced and constructed a map of the world.”

Nevertheless, OpenStreetMap information alone wasn’t complete sufficient. “If we had solely used OpenStreetMap, we’d have been left with loads of crosswalks lacking,” Laefer defined. “So we additionally used satellite tv for pc imagery instruments to measure the remaining crosswalk distances.”

Their approach revealed distinct patterns in every city setting. In accordance with the revealed paper, the common crosswalk lengths have been roughly 26 ft in Paris (.03% at 70 ft or longer), about 43 ft in San Francisco (4.4% at 70 ft or longer), and about 58 ft in Irvine (with about 20% at 70 ft or longer). Crossings over 50 to 60 ft begin to present a better focus of pedestrian collisions, in accordance with Moran.

The examine confirmed a major correlation between crosswalk size and pedestrian security in all three cities examined. Longer crosswalks have been related to increased possibilities of pedestrian-vehicle collisions, with every further foot rising collision chance by 0.8% to 2.11%. Crossings the place current collisions occurred have been 15% to 43% longer than metropolis averages.

Moran sees this analysis as a strong software for metropolis planners and policymakers. “The three cities we’ve mapped now have these datasets, and may consider totally different investments and make knowledgeable choices in pedestrian infrastructure,” he defined.

The potential for this analysis to tell public coverage extends past these three cities. Moran and his staff are planning to scale up their method to the 100 largest cities in the US, doubtlessly making a public useful resource for exploring crosswalk distances.

In accordance with Moran, easy measures may considerably enhance pedestrian security on crosswalks. “Small low-tech methods to enhance the pedestrian setting can actually result in security advantages. These can embody extending the sidewalks out from either side and placing pedestrian refuge islands within the center,” Moran famous.

This examine is a part of Moran’s broader effort to enhance city transportation. He explains, “I am attempting to make city transportation safer, extra sustainable and extra equitable. I take advantage of quite a lot of strategies like mining information, satellite tv for pc imagery and discipline assortment to know our streets, how they’ll change, and the way these modifications can result in these improved outcomes.”