Bike Infrastructure Explained: Bike Box

Posted on: June 8, 2018 Posted by: Judi Tentor Comments: 0

Bike Infrastructure Explained: Bike Box

Bike box
Bike box University Ave and 6th Ave

This post is the first in a series of posts that will explain and illustrate bicycle infrastructure designs. These are the designs we want to see on our streets. These are designs that provide solutions for rider safety and comfort. All of the infrastructure featured is from the NACTO Urban Bikeway Design Guide which “is based on the experience of the best cycling cities in the world.” And here at BikeSD we want San Diego to be one of the best cycling cities in the world! So let’s start with BIKE BOX.

What is a bike box? If you google bike box, you will see a shipping box, but that is not what we are talking about. A bike box is a designated area (generally painted green) at the head of a traffic lane at a signalized intersection (an intersection with a stop light or traffic light.) It provides bicyclists with a safe and visible way to get ahead of a line of traffic during the red signal phase (when the light is red.) Nearly all the benefits of a bike box are related to increased safety for riders. But, there are some benefits to motorized vehicles that come from using bike boxes.

Bike Box Benefits

A bike box increases VISIBILITY of people riding bicycles. There are things that riders do to make themselves visible such as wearing bright clothing and using flashing lights. Being visible is key to bicycling safety. A bike box on the street helps bicycles be more visible at intersections. The bright green painted box highlights a location and motorists can expect to see someone on a bicycle in that location.

A bike box decreases the chance of a RIGHT HOOK which is a leading cause of both car vs bicycle and car vs pedestrian crashes. A right hook dangerous crash that involves a vehicle turning right into the path of a pedestrian or a bicycle going straight. Bike boxes can help prevent this kind of crash because the bicycle rider is positioned at the front of motor vehicles at the intersection.

A bike box provides PRIORITY for bicyclists at signalized intersections of major streets. Groups of bicyclists together can clear an intersection quickly, minimizing impediment to transit or other traffic. This priority has benefits for motorized vehicles because the people on bicycles in the bike box clear the intersection more quickly than a line of bicycles so right turning traffic moves through the intersection more quickly.

Bike Boxes in San Diego

Bike box in Hillcrest showing car encroaching
Bike box in Hillcrest

The intersection of University Ave and 6th Ave in Hillcrest has a bike box as part of the recently painted bike lanes. Cars are supposed to stop at the edge of the box, but have not yet learned how to use the infrastructure. Some bike boxes have WAIT HERE painted at the limit line of the box.

The new infrastructure on University Ave helps with comfort and safety. It is not perfect, but it is a start.

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