State Route 300 (abbreviated SR 300) is a four-lane controlled-access expressway inside of Memphis, Tennessee that goes from Interstate 40 to U.S. Highway 51. SR 300 is unsigned throughout its length except on mileposts. The exit signs on I-40 just refer to SR 300 as Exit 2A going to Highway 51 and Millington. SR 300 carries a 55 mph (89 km/h) speed limit. Local media sometimes refers to this short route as the "101 connector," possibly the former name of the route before becoming a state highway.
SR 300 was originally part of an abortive effort in the 1960s to build an expressway connecting the northern portion of the then Interstate 240 to Mud Island. Ghost ramps and abandoned grading for this expressway still exist at the current western terminus of SR 300 at U.S. Highway 51 and also at Interstate 40 Exit 1 in downtown Memphis.