From NJ:

Directions Distance
1. Start out going SOUTH on US-1 S/BRUNSWICK PIKE toward FRANKLIN CORNER RD/BENJAMIN FRANKLIN RD/CR-546. 0.6 miles (0.9 km)
2. Turn RIGHT onto FRANKLIN CORNER RD/BENJAMIN FRANKLIN RD/CR-546. Continue to follow FRANKLIN CORNER RD/CR-546. 0.7 miles (1.2 km)
3. Turn RIGHT onto PRINCETON PIKE. 0.5 miles (0.8 km)
4. Merge onto I-95 S toward PENNSYLVANIA. 3.8 miles (6.1 km)
5. Take the RT-31 N exit, EXIT 4, toward PENNINGTON. 0.3 miles (0.5 km)
6. Turn SLIGHT RIGHT onto PENNINGTON RD/NJ-31 N. 1 miles (1.7 km)
7. Enter next roundabout and take 2nd exit onto NJ-31 N. 10.3 miles (16.6 km)
8. Stay STRAIGHT to go onto US-202 N/NJ-31 N 5.6 miles (9 km)
9. Enter next roundabout and take 2nd exit onto NJ-31 N. 10.1 miles (16.3 km)
10. Merge onto I-78 W via the ramp on the LEFT toward PHILLIPSBURG. 28.4 miles (45.8 km)
11. Take the PA-412 exit, EXIT 67, toward HELLERTOWN/BETHLEHEM. 0.5 miles (0.8 km)
12. Turn RIGHT onto PA-412/HELLERTOWN RD. Continue to follow PA-412. 2.7 miles (4.3 km)
13. Turn RIGHT onto POLK ST. 0 miles (0.1 km)
Total Distance: 64.6 miles (104 km)
Estimated Time: 1 hours, 20 minutes

From Reading, PA:
Directions Distance
1. Start out going WEST on PENN ST toward S 5TH ST/US-222 BR. 0 miles (0.1 km)
2. Turn RIGHT onto N 5TH ST/US-222 BR. 0.5 miles (0.8 km)
3. Turn SLIGHT LEFT onto CENTRE AVE/PA-61 N. Continue to follow PA-61 N. 4.8 miles (7.7 km)
4. Turn SLIGHT RIGHT onto ramp. 0.3 miles (0.5 km)
5. Merge onto US-222 N. 1.4 miles (2.3 km)
6. Merge onto US-222 N via the exit on the LEFT toward ALLENTOWN. 23.6 miles (38 km)
7. Merge onto I-78 E. 12 miles (19.4 km)
8. Take the PA-412 N exit, EXIT 67, toward BETHLEHEM. 0.4 miles (0.7 km)
9. Turn SLIGHT RIGHT onto PA-412. 2.9 miles (4.7 km)
10. Turn RIGHT onto POLK ST 0 miles (0.1 km)
Total Distance: 46 miles (74.1 km)
Estimated Time: 1 hours, 0 minutes