Poll: I couldn't find a parking space because there were so many cars parked on _____ of the road.

becka

that was a stupid vote to be doing really

HIGHTHEE

since roads can only have two sides, either and both can be use to refer to two alternating things. so they are both correct

scduck

You can have either this or that but not both.
Both is correct.

scduck

I mean 'Both sides' is the correct answer.