Maryland Route 528

Known for most of its length as Coastal Highway, the state highway runs 9.04 miles (14.55 km) from the southern terminus of its companion route, unsigned Maryland Route 378 (MD 378), in downtown Ocean City north to the Delaware state line at the northern edge of the resort town, where the highway continues as Delaware Route 1 (DE 1).

MD 528 was expanded to a six-lane divided highway north of the one-way pair in the late 1980s.

MD 528 and MD 378 both have their southern termini at the intersection of Baltimore Avenue and South 1st Street at the southern end of Ocean City north of the Ocean City Inlet.

Baltimore Avenue continues south and then turns east as South 2nd Street toward the Hugh T. Cropper Inlet Parking Lot that serves attractions on the Ocean City Boardwalk along the Atlantic Ocean, including the Trimper's Rides amusement park and the Ocean City Life-Saving Station.

[1][4] The road heads into the Midtown section of Ocean City, which is home to numerous restaurants and nightlife, at 28th Street.

[1][4][5] Farther north, the route runs past more businesses and hotels, heading east of the 144th Street Transit Center before it reaches the Delaware state line at 146th Street, two blocks east of the Fenwick Island Light.

[5] As the main north-south road in Ocean City, MD 528 experiences heavy traffic in the summer months as the resort town sees a large number of visitors and seasonal residents.

[7] MD 528 is a part of the main National Highway System from US 50 to the Delaware state line.

[13] MD 528 was extended north to the Delaware state line when Coastal Highway was completed in 1939.

[14][15] In the 1940s, traffic in Ocean City increased so much there was a movement to make Baltimore and Philadelphia Avenues one-way in the downtown area, a change that was implemented by 1948.

Construction on the first phase was expected to begin in January 2017 and be finished by Memorial Day of that year,[24] but was delayed after the only bid came in over the $4.5 million budget.