You can't enter a highway because of heavy traffic. What action should you take before you can enter it?Pull up as far as you can on the ramp and wait leaving room behind you on the ramp for other vehicles. Drive to the shoulder and wait for a gap in the roadway, then accelerate quickly. Slow down on the entrance ramp to wait for a gap, then speed up so you enter at the same speed that traffic is moving. Slow down on the entrance ramp to wait for a gap, then sound your horn and activate your emergency flashing lights to alert drivers you are entering the roadway.