-5
-4
-3
-2
-1
0
1
2
3
4
5
-15 & -20
-10
-5
+5
+10 & +15
Change in Posted Speed Limit, mi/h
Average
Change
Maximum
Increase
Maximum
Decrease
www.bhspi.org
Source: FHWA Office of Safety and Traffic Operations R&D
SAFEST SPEED
Built Up Areas
–
Behavior Doesn
Õ
t Change