The 3 bonus objectives are:
Complete the challenge at nightBefore you start, there are two options to either do the tutorial or change to night time. Click the night option, and then you can turn on your headlights with

.
Don't use the winchYou shouldn't need to use it if you stay on the road. Turn your wheels back and forth if you get stuck.
Never release the acceleratorYou can activate cruise control by holding down

, but it is safer just to hold

. This way you don't accidently change gears.