Location: Bel Air Byp and Fountain Green Rd, Harford Cty Reassurance shield after the 543 junction. Location: Bel Air Byp and Conowingo Rd, Harford Cty Just after that, US 1 Business rejoins. Turn left for 1 Business back south.  N to MD-136, S to MD-23  S to MD-543  N to US-1 Bus, S to MD-22