The image is a diagram that shows how a cyclist runs into a door flung open from a parked car. The diagram is divided into two sections. 

In the top section, there is an illustration of a car driving on a road with a yellow arrow pointing towards the left side of the image. The car is white and appears to be in motion. The cyclist is wearing a helmet and is holding onto the handlebars of the car with both hands. The text above the illustration reads "In most American cities, the most common car/bike crash is "dooring."

The text below the illustration explains that the cyclist can be serious, even fatal, as the rider is thrown diagonally into the lane when the handlebar flip to the right. This often lands the stunned cyclist in the path of following traffic.