If you really want to avoid interstates, the directions below will allow you to do so. The route is slower and takes you through a number of towns, however the road is/was good the whole trip. I've used this route a number of times when we lived in the area.
Time Mile Instruction For Toward
Summary: 76.4 miles (1 hour, 47 minutes)
9:00 AM 0.0 Depart Gettysburg on US-15 Branch [PA-116] (North) 65 yds
9:00 AM 0.1 At roundabout, take the FIRST exit onto US-30 [PA-116] 0.2 mi
9:00 AM 0.3 Keep STRAIGHT onto PA-116 [Hanover St] 1.5 mi
9:03 AM 1.8 Keep STRAIGHT onto PA-116 [Hanover Rd] 54 yds
9:03 AM 1.8 Take Ramp (RIGHT) onto US-15 1.7 mi US-15 S / Frederick
9:05 AM 3.6 Keep RIGHT onto Ramp 0.1 mi PA-97 / Baltimore St
9:05 AM 3.7 Turn LEFT (South-East) onto PA-97 [Baltimore Pike] 9.2 mi
9:18 AM 13.0 At Georgetown, stay on PA-97 [Baltimore Pike] (South) 0.1 mi
9:18 AM 13.1 Entering Maryland
9:18 AM 13.1 Road name changes to MD-97 [Littlestown Pike] 10.4 mi
9:31 AM 23.5 Take Ramp (RIGHT) onto MD-140 [MD-97] 2.5 mi MD-140 E / MD-97 S / Baltimore
9:34 AM 26.0 Turn RIGHT (South-West) onto MD-97 [Malcolm Dr] 4.4 mi
9:39 AM 30.4 At MD-97, stay on MD-97 [New Washington Rd] (South) 5.7 mi
9:45 AM 36.1 At roundabout, take the SECOND exit onto MD-97 [Old Washington Rd] 18.6 mi
10:11 AM 54.6Turn RIGHT (South-East) onto MD-97 [Georgia Ave] 5.1 mi
10:19 AM 59.7Turn LEFT (East) onto MD-28 [Norbeck Rd] 0.2 mi
10:20 AM 59.9 At MD-28, stay on MD-28 [Norbeck Rd] (North) 4.9 mi
10:28 AM 64.8 Road name changes to MD-198 [Spencerville Rd] 3.4 mi
10:34 AM 68.2 Keep RIGHT onto Ramp 0.2 mi
10:34 AM 68.4 Take Ramp (LEFT) onto US-29 [Columbia Pike] 0.3 mi
10:35 AM 68.7 Turn LEFT (East) onto Blackburn Rd, then immediately turn LEFT (North) onto US-29 [Columbia Pike] 0.1 mi
10:36 AM 68.9 At US-29, stay on US-29 [Columbia Pike] (North) 0.2 mi
10:36 AM 69.1 Keep RIGHT onto Ramp 0.2 mi MD-198 / Burtonsville / Laurel
10:37 AM 69.3 Keep LEFT to stay on Ramp 43 yds MD-198 W / Burtonsville
10:37 AM 69.3 Keep STRAIGHT onto Local road(s) 21 yds
10:37 AM 69.3 Turn LEFT (West) onto MD-198 [Sandy Spring Rd] 0.2 mi
10:37 AM 69.5 Turn LEFT (South) onto Old Columbia Pike 32 yds
10:37 AM 69.5 Keep STRAIGHT onto Ramp 0.2 mi
10:37 AM 69.7 Take Ramp (LEFT) onto US-29 [Columbia Pike] 3.4 mi
10:41 AM 73.1 Keep RIGHT onto Ramp 0.2 mi Cherry Hill Rd / E Randolph Rd
10:41 AM 73.3 Turn LEFT (East) onto Cherry Hill Rd [E Randolph Rd] 98 yds
10:42 AM 73.4 Keep STRAIGHT onto Cherry Hill Rd 3.0 mi
10:47 AM 76.4 Arrive Cherry Hill Park [9800 Cherry Hill Rd, College Park MD 20740, United States, Tel: +(1)-301-9377116]
