Public Safety Category

Category: Public Safety

Newtown-Yardley Road Pedestrian Safety Measures

Posted on 18 Sep 2022, 01:21 - Category: Public Safety

An Expert's Critique of the JMZO 5G Wireless Ordinance

Posted on 22 Jun 2022, 12:57 - Category: Public Safety

Lower Dolington Road Trail Construction Barricades Are a Pedestrian Safety Concern!

Posted on 15 Jun 2022, 12:42 - Category: Public Safety

Crosswalk Visibility Study

The subject of crosswalk visibility came up in a conversation I recently had with a Bucks County Courier Times reporter. We were talking about the recent pedestrian death while using the crosswalk at N Sycamore St and Silo Drive (read “Sycamore Street Is Popular, But Is It Safe?”). It was suggested that the brick crosswalk (see photo below) is difficult for drivers to see at night.

A view of the crosswalk at the N Sycamore and Silo Dr intersection.
Is there a visibility problem with this type of crosswalk?

I’m no expert on the visibility of crosswalks, but the people at the U.S. Department of Transportation and the Texas Transportation Institute are. In 2010, these experts investigated the relative daytime and nighttime visibility of three crosswalk marking patterns: transverse lines (e.g., like the crosswalks on N Sycamore St), continental, and bar pairs (see figure below).

These markings are used in conjunction with signs and other measures to alert road users to a designated pedestrian crossing point. Although the Manual on Uniform Traffic Control Devices (MUTCD) contains basic information about crosswalk markings, many municipalities develop practices that are not discussed in the MUTCD.

The following is a synopsis of a “TechBrief” of the 2010 Crosswalk Marking Field Visibility Study.

The Study

The three crosswalk marking patterns studied.

In this study, participants drove an instrumented vehicle on a route through the Texas A&M University campus in College Station, TX. The route provided an open road environment that included portions in a typical college setting (e.g., sidewalks, buildings, basketball arena) and roads through the agricultural area of the campus, which were more rural in feel. Roadway lighting was present at each of the crosswalk locations. The study vehicle was equipped with instrumentation that allowed the researchers to measure and record various driving performance data. However, the vehicle operated and drove like a normal vehicle.

Conclusions

The detection distances to continental and bar pairs are statistically different from transverse markings. A general observation is that the continental marking was detected at about twice the distance upstream as the transverse marking during daytime conditions (see figure below). This increase in distance reflects 8 seconds of increased awareness of the crossing for a 30-mph operating speed.

This figure from the study shows the most relevant result: Traverse-type crosswalks like those on N Sycamore St are less visible than the continental and bar pairs designs.

Recommendation

Based on the findings from this research, the researchers recommended that municipalities consider making bar pairs or continental the “default” for all crosswalks across uncontrolled approaches (i.e., not controlled by signals or stop signs), with exceptions allowing transverse lines where engineering judgment determines that such markings would be adequate, such as a location with low-speed residential streets.

Painting continental markings (bars) over the brick crosswalks on N Sycamore St
could be an economical method of making them more visible to motorists.

Posted on 06 Jan 2022, 13:08 - Category: Public Safety

It's Time to Improve Pedestrian Safety on N Sycamore Street!

Posted on 27 Dec 2021, 01:57 - Category: Public Safety

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