In what way do emotions function like a drive?

Emotions show how you feel at that exact moment.
So if i we're to drive with no traffic, it would mean that it would be a good day with no worries.
If i had major traffic driving, it would mean alot of things are happening at once and it would make me angry and frustrated.

If that is what you mean by drive, i have just explained what you need.
Please comment if you mean something else than the drive i mean.