According to domestic and foreign specifications, horizontal forces for piers subjected by vehicle collision were discussed. The models of pier and small vehicle were designed and made. Experiments of small vehicle collision with piers were tested with different pier dimensions and varied small vehicle velocities. Testing data about dynamic strain and acceleration of pier models, acceleration of small vehicle model were collected. Based on the analysis of testing data, it can be seen that the collision force is related to the collision velocity and the pier size. The research results provide the data support for further research of the real vehicle-bridge collision.