Although intersections represent a relatively small portion of a bicyclist's travel route, they are where a cyclist is most at risk of being involved in a traffic accident. Only around 11 percent of bicycle accidents involve a collision with a car; but of these, 45 percent take place in intersections. (The majority of bicycle accidents involve only the cyclist, who loses control of the bike and crashes.)
It also pays to learn the basic legal rules of liability—that is, who is responsible for a traffic accident. Cyclists who don't follow road rules or don't keep a proper lookout might be deemed at fault. So to avoid liability for an accident, cyclists must understand—and follow—both the basic legal rules of liability and the rules of the road.
Intersections pose a special risk to cyclists for many reasons: drivers may underestimate the speed of a bike; drivers might not always be watching out for bikes; and even if a driver is on the lookout for bikes, they sometimes just don't see them because bikes are smaller and can blend into the background (due to the biker's clothing, the sun, and other factors).
Cyclists should keep this in mind and take extra precautions to avoid accidents at intersections by:
Legally speaking, in nearly every state a bicycle is considered to be a "vehicle" and therefore, just like motorists, cyclists must follow the rules of the road. When it comes to collisions occurring at intersections, liability usually boils down to who had the right-of-way, the car or the bike.
Right-of-way rules: No traffic signals. Generally, when two vehicles approach an intersection not controlled by a traffic signal, the vehicle arriving first has the right of way. If the vehicles arrive at the same time, the vehicle to the right has the right-of-way. This is also the rule for vehicles approaching intersections controlled by stop signs—the vehicle to the right has the right of way. If, however, the intersection consists of a minor street intersecting with a major street, then the traffic on the major street has the right-of-way.
Right-of-way rules: Traffic signals. The right-of-way at intersections controlled by signals is determined by the signal. If a signal sensor is unable to detect the presence of a bicycle, the cyclist can (1) position the bicycle closer to the sensors embedded in the road, and if that doesn't work, wait until it is safe to cross against the light, or (2) cross at the crosswalk.
Having said that, there are other legal considerations that come into play depending on the type of intersection and whether the car is turning or going straight through. These different intersection situations require cyclists to use different defense techniques to avoid accidents.