 U.S. Highway 287 becomes College Avenue inside the city and is the busiest street; It runs north and south, effectively bisecting the city, and serving as the east–west meridian, while Mountain Avenue is the north-south.SH 14 runs concurrent with US 287 at the northern city limit to Jefferson Street, running southeast along Jefferson (later turning into Riverside Avenue), then turning east onto Mulberry Street where it goes east out of the city after an interchange with Interstate 25.Fort Collins also once had a municipally owned trolley service with three branches from the intersection of Mountain and College avenues.