| US 41 Bus. near Tampa|
| US 41 near Tampa|
State Road 678 (SR 678) is a 0.501 miles (0.806 km) stretch of Bearss Avenue between Florida Avenue (Business US 41/SR 685) and Nebraska Avenue (US 41/SR 45) in Tampa, Florida. Similar to SR 579 to the south, it connects those two north–south roads with Interstate 275 (SR 93), halfway between them. SR 678 is signed east–west.
Florida State Road 678 Wikipedia
State Road 678 serves as a connector between US 41 Business and US 41. State Road 678 has its western terminus at an interchange with US 41 Business. At this point, Bearss Avenue, designated as County Road 678, becomes State Road 678. Immediately the roadway widens to 6 lanes as it begins its eastern route. The state road along its entire stretch goes through a commercial district with numerous strip malls. After .3 miles from its western terminus, State Road 678 has an interchange with Interstate 275, providing access to both the interstate's northbound and southbound lanes. After the interchange, the number of lanes on the road thins down to 4. State Road 678 continues through the shopping district before each its eastern terminus with US 41 after .2 miles. At its eastern terminus, East Bearss Avenue loses its state road signage and returns to being County Road 678.
The entire route is in Hillsborough County.