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MD 4 runs east from DC thru Upper Marlboro and then SE and south. For the length of this exit list (all the way to DC), there are no driveways on MD 4. IOW the non-freeway part can be easily converted to freeway. There are some frontage roads in Calvert County, most of which are state-maintained as secret MD 794 and 980.

4	258 259 794 980 Bristol Deale			980 794 258 259 EAST Service Road Bristol Deale Mt Zion	4	diamond
4				980 Pindell Rd	4
4	794 Sands Rd			980 Plummer Ln	4
4	408 EAST 794 980 Waysons Corner			408 EAST 794 980 Waysons Corner Annapolis	4 Prince Frederick	diamond
4	726 Old Marlboro Pike				4	half diamond
4	202 Largo Rd				4	Y
4	97 Baltimore Richmond VA			97 Richmond VA Baltimore	4
4 Upper Marlboro Washington	301 NORTH Baltimore 301 SOUTH Richmond VA			301 NORTH Baltimore 301 SOUTH Richmond VA	4 Prince Frederick	cloverleaf
4 Washington	717 Upper Marlboro			717 Upper Marlboro	4 301	diamond
4 Washington				Old Crain Hwy	4	half diamond
4	980 Ritchie-Marlboro Rd				4	Y
4 Washington	223 Woodyard Rd Mellwood Rd Clinton			223 Woodyard Rd Mellwood Rd Clinton	4	NE 5 ramp parclo
4	Dower House Rd			Marlboro Pike Dower House Rd	4
4	Presidential Pkwy Suitland Pkwy 337			Suitland Pkwy Presidential Pkwy 337	4
4	Armstrong Ln				4
4	Westphalia Road			Westphalia Road	4
4 Pennsylvania Ave Washington	95 495 NORTH Beltway NORTH Baltimore College Park 95 495 SOUTH Beltway SOUTH Richmond VA Alexandria VA			95 495 NORTH Beltway NORTH Baltimore College Park 95 495 SOUTH Beltway SOUTH Richmond VA Alexandria VA	4 Pennsylvania Ave Upper Marlboro	cloverleaf I-95 exit 11
4	Forestville Rd			Forestville Rd	4
4	Donnell Dr			Donnell Dr	4
4	Walters Ln			Walters Ln	4
4	Regency Pkwy			Regency Pkwy	4
4	Parkland Dr			Parkland Dr	4
4	Silver Hill Rd 458 458			Silver Hill Rd 458 458	4
4	Penn Crossing Dr			Penn Crossing Dr	4
4	Brooks Dr			Brooks Dr	4
4	Quarter Ave Spaulding Ave			Spaulding Ave Quarter Ave	4
4	Alton St Shadyside Ave			Shadyside Ave Alton St	4
4	Cedar Hill Cemetery			Cedar Hill Cemetery	4
PA Ave	Southern Ave			Southern Ave	4