When used on a verb of motion, the prefix до- has the meaning 'to, up to'. It is often used in asking directions (synonymous with про- with к +Dat.).
Дойдќте до вторћго светофћра. Go to the next stoplight.
ВІ не скђжете, кђк дойтќ до ресторђна «Пекќн»? Could you tell me how to get the Peking?