Merging into heavy traffic can be difficult, especially on interstates and highways where cars are traveling at high rates of speed. Even experienced drivers can make mistakes when merging. For inexperienced drivers, attempting to merge into heavy traffic at high speeds can result in a traffic accident. Incorrect merging maneuvers can cause other drivers to swerve into other lanes or slam on the breaks. On an interstate, the result could be a multi-car accident. It is extremely important that all drivers learn proper merging rules and follow those rules each time they change lanes or enter traffic from an off-ramp.