Almost every bike rider has experienced it: A hostile driver cuts you off, buzzes by within inches, or yells obscenities as you pedal. The experience is more than frightening—it’s potentially life-threatening. Unfortunately, cyclists have had little recourse. Until now. Ernest Ezis of Boulder, CO, was tired of hearing about riders being harassed by motorists with no way to warn their peers of repeatedly dangerous drivers. His solution? He created the Close Call Database, a website where cyclists can identify and track aggressive motorists.

The concept is simple. Cyclists involved in an episode of car-on-bike ire can report the encounter on the site. As reports accrue, patterns of serial aggressive driving should become evident. If one of those drivers is ever involved in an incident with a cyclist, the compiled information could help to build a legal case against him or her. Ezis also hopes that police will use the information to confront hostile drivers and encourage them to change their habits before an accident occurs.

The Close Call Database currently deals only with intentionally aggressive incidents and Ezis asks that users do not report instances of carelessness, ignorance, or genuine mistakes. The site asks that cyclists who experience an aggressive-driving episode provide some specifics: location, time, license-plate number, car details, and how dangerous they perceived the threat to be.

Once a report is filed, the site alerts every member within a 60-mile radius. To register you can create a new account or sign in with Strava.

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