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The Bel Air Bypass (US 1) has no driveways. IOW it can be easily converted to freeway, and in fact an interchange has been built, plus several overpasses.

1	Harford Rd 147 1			Harford Rd 1 147	1
1 24	24			24	1
1 Philadelphia	924 SOUTH Bel Air 24 NORTH Forest Hill Rocks			24 NORTH 924 SOUTH Bel Air Forest Hill	1 24 Edgewood Baltimore	NE 5 ramp parclo
1	Conowingo Rd 1 1 (turn left here) Bynum Rd Granary Rd 1 23 1			23A (where the 2 halves of US 1 come together) Bynum Rd 1 23 23A (turn left here) Granary Rd 1 1 23 (turn right here)	1