But you are correct i wouldn't want to walk it.
Directions Distance Time
Start: Depart Start @ Hilton/Dedham
1: At roundabout, take the FOURTH exit onto Ramp (I-95 / US-1 / Providence RI / Boston) 0.4 0:01
2: Merge onto I-95 [US-1] 1.4 0:01
3: Take Ramp (RIGHT) onto I-95 (I-95 / Providence RI) 15.0 0:14
4: At exit 6A, take Ramp (RIGHT) onto I-495 (I-495 / Taunton) 2.4 0:02
5: At exit 12-11, turn RIGHT onto Ramp (RT-140 / Mansfield / Norton) 0.3 < 1min
6: Keep LEFT to stay on Ramp (RT-140 / Norton) 0.4 0:01
7: Keep RIGHT to stay on Ramp (RT-140 / Mansfield / Norton) 0.3 < 1min
8: Take Ramp (RIGHT) onto SR-140 [S Main St] (RT-140 / Norton) 0.3 0:01
End: Arrive @ Tweeter Center, Mansfield, MA
Total Route 20.7 mi 21 mins