State Road 100 is a 153-mile-long (246 km) east–west highway serving northeast Florida. Its western terminus is at the Georgia-Florida border four miles (6.4 km) north of Avoca, Florida ; its eastern terminus is an intersection with Shore Scenic Highway in Flagler Beach. The portion west of Lake City is only signed as portions of US 41 and US 129, both of which run north–south.

U.S. Highway 41 (US 41) in the state of Florida is a north–south United States Highway. It runs 479 miles (771 km) from Miami in South Florida northwest to the Georgia state line north of the Lake City area. Within the state, US 41 is paralleled by Interstate 75 (I-75) all the way from Miami to Georgia, and I-75 has largely supplanted US 41 as a major highway.