Question Passive railroad crossings: Answers Are controlled by flashing lights. Are not controlled by any type of traffic control device. Have gates that lower when trains are approaching. Should never be crossed by a CMV. Explanation Railroad crossings that are not controlled by any type of traffic control device are known as passive crossings. The decision to proceed across tracks at a passive crossing is entirely up to the driver. Take a FREE Practice Test Now This questions appears in the following tests: Massachusetts Knowledge Test Class A , Delaware Knowledge Test Class B , District Of Columbia Knowledge Test Class B , Texas Knowledge Test Class B , Wisconsin Knowledge Test Class B ,