Location: Bel Air Byp and East-West Hwy, Harford Cty Reassurance shield after the MD 23 junction. Location: Bel Air Byp and Fountain Green Rd, Harford Shortly thereafter, we’ll approach MD 543. Location: Bel Air Byp and Fountain Green Rd, Harford Cty Follow 543 north to Ady and south to I-95. Location: Bel Air Byp and … Continue reading U.S. Route 1, MD-23 to MD-543