You must have your motorcycle's headlight turned on

1. only in rain or fog.
2. only in the daytime.
3. only at night.
4. whenever you're driving. ✓

Answer: D. whenever you're driving.

You must have your motorcycle's headlight turned on whenever you are driving, not just in certain conditions.

Why this is the answer

The handbook's description of the light switches explains that on most modern motorcycles and mopeds the headlight and tail light come on by themselves as soon as the ignition is switched on and the engine is running. In other words, the light is on the whole time you ride, so there is no day, night, rain or fog condition where you would be riding with it off. The only thing you control is the switch between low beam and high beam, which sits on the left handlebar and is worked with your thumb.

Why the other answers are wrong

• A. only in rain or fog. — Rain and fog are not the trigger for the headlight, because the handbook says the light comes on with the ignition and stays on while the engine runs.
• B. only in the daytime. — Limiting the headlight to daytime riding is wrong, since the handbook treats the light as on automatically for the whole time the engine is running, day or night.
• C. only at night. — Night only is wrong because the headlight comes on automatically at ignition, not when darkness falls, so it is lit during daylight riding too.

Remember it

Treat the ignition as the headlight switch: engine running, light on.