The following are some of the most common causes of merging accidents:nLack of signaling: Whether you are entering a highway or changing lanes, you must always use your signal to alert other motorists that you are going to be changing lanes or merging into traffic. This gives other drivers the opportunity to move into another lane and allows you to merge safely.nSpeed differential: When entering a highway where vehicles are already traveling at high speed, it can be difficult to find an opening in the traffic flow where you will have enough time to accelerate and match the speed of other vehicles. Generally, you should accelerate on the ramp to reach the speed of highway traffic, then merge into the right-hand lane when it is safe to do so.nAggressive driving: Tailgating, cutting off other drivers, changing lanes without signaling, speeding, and road rage are all examples of aggressive driving. This driving behavior can make it more difficult to merge safely and increase the risk of a serious merging car accident.