![](https://lstatic.shangxueba.com/sxbzda/h5/images/m_q_title.png)
---CAUTION---HAZAROUS CAUTIONS AHEADROUGH, NARROW ROAD WITHLOOSE GRAVEL, STEEP GRADESAND B
---CAUTION---
HAZAROUS CAUTIONS AHEAD
ROUGH, NARROW ROAD WITH
LOOSE GRAVEL, STEEP GRADES
AND BLIND CURVES
DO NOT EXCEED 15 M. P. H.
ATTENTION
VEHICLES OVER 21 FT/6.4M
PROHIBITED BEYOND THIS POINT
What is the highest driving speed allowed here?
A.0M.P.H.
B.5M.P.H.
C.2 M.P.H.
D.6.4M.P.H.
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)