Tired of cars passing you too closely while bicycling at night? Some designers have created a system to project your own bicycle lane on the street behind you, using lasers. Tip: Martin.

Left: laser bike lane concept from Altitude. Right: 3 Feet Please bike jersey.

From the picture (left above), these lines don’t seem to be three feet from the cyclist, however. The law in DC (as of December) and in many other places requires three feet. What about combining this laser idea with Joe Mizerek’s “3 Feet Please” bike jerseys, and projecting lines three feet to either side of the cyclist, with the words “3 feet please”? Then motorists can be sure of the safe distance to pass.

David Alpert is Founder and President of Greater Greater Washington and Executive Director of DC Sustainable Transportation (DCST). He worked as a Product Manager for Google for six years and has lived in the Boston, San Francisco, and New York metro areas in addition to Washington, DC. He lives with his wife and two children in Dupont Circle. Unless otherwise noted, opinions in his GGWash posts are his and not the official views of GGWash or DCST.