Question Water that has collected on a roadway can cause: Answers Hydroplaning. Acceleration. Stopping. Explanation The risk of hydroplaning begins when water has collected on the surface of a road. This questions appears in the following tests: Hawaii Class B Knowledge Test Idaho Class B Knowledge Test Kentucky Class B Knowledge Test Kentucky Double Kentucky Tank Louisiana Class A Knowledge Test Louisiana Class B Knowledge Test Maine Class A Knowledge Test Maine Class B Knowledge Test Michigan Class B Knowledge Test Minnesota Double Missouri Class B Knowledge Test Ohio Class A Knowledge Test Ohio Passenger Rhode Island Class B Knowledge Test Washington Class A Knowledge Test Washington Passenger