The Golden Gate Bridge, the powerful yet graceful landmark that has become synonymous with San Francisco around the world, opened 72 years ago today - but only to pedestrians. Drivers had to wait a day. Construction of the bridge, authorized in 1924 by the U.S. War Department, started in 1933, and cost $35 million in voter-approved bonds plus $39 million in interest that was gradually paid off by bridge tolls until 1971. The original toll was 50 cents in each direction for cars with four or fewer people; each additional passenger cost another nickel.