Originally Posted by
SFOSpiff
The national 55 mph speed limit was dropped 15 years ago, so if a state still has one, they either like throwing people in jail (South Carolina) or may have smaller highways that pre-date the Interstate system (mostly the northeast).
There's a number of Bay Area freeways with 55 mph speed limits by choice. They tend to focus around heavily congested areas such as San Francisco or the Bay Bridge itself. In the county I live, all the freeways are 65, and if you hit I505 which connects to I5 out in the country it jumps to 70.