Cars are allowed on Lombard Street in San Francisco although the iconic ‘crooked’ section is one-way only, downhill between Hyde and Leavenworth streets.
To drive down the famous zigzag section you will need to approach from the west on Lombard Street, or alternatively head north on Hyde Street and turn right at Lombard Street to access the top of the hill. Note that vehicles traveling south on Hyde Street are not allowed to turn left onto Lombard Street.
Bear in mind that it is a popular tourist attraction and in summer months, particularly at weekends, there can be long lines of cars backed up on Lombard Street waiting their turn to drive down. Mornings are generally the least busy time.