San Andreas Highway 1

San Andreas Highway 1 is a four-lane freeway connecting the two cities of San Fierro and Los Santos. Built originally as a 2-lane road during the 1930s, it was expanded to four lanes in a project that lasted from 1963 - 1967. SA1 was a turnpike between 1967 and 1989, before it was opened to public without toll charges.

Right before its southern terminus at the Richman Tunnel, Old SA1 runs parallel with the new SA1 before it turns 90 degrees and joins the older SA-27. Before the four-lane expansion, SA1 was a two-lane road from its southern beginning in Los Santos all the way up to the Whetstone Bridge, which had been widened to four lanes already in 1945. The four-lane road north of Whetstone Bridge recieved a upgrade with better fundament and road barriers when whole SA1 recieved a upgrade.

Today, SA1 terminates at the T-interchange onto the San Fierro Bypass. Before the construction of the bypass, SA1 terminated on Market Street.