Final answer:
To cross tracks that run parallel to your course, the best practice is to cross at an angle when it is safe to do so, in order to quickly and safely pass over the tracks.
Step-by-step explanation:
The question pertains to the safety measures one should take while approaching and crossing railroad tracks that run parallel to the road. The correct answer is to cross at an angle (d), assuming this is possible. This technique allows for a quicker and safer passage over the tracks, especially if they are raised, as it reduces the risk of the vehicle getting caught on the tracks. It's essential to look for trains and ensure that it's safe to cross before doing so.
Points a, b, and c suggest using high beams, increasing speed, and applying brakes suddenly, which are not the correct options because these actions do not inherently make crossing parallel tracks safer. High beams would not improve visibility on the tracks themselves, increasing speed could be dangerous, and applying brakes suddenly could increase the chance of a collision if there is traffic behind you.