nda
Member
- Joined
- Jan 11, 2015
- Messages
- 19
- Reaction score
- 0
A curve of radius 340 feet, side friction factor, fs = 0.16, and super-elevation of 8% is
located at a section of an existing rural highway, which restricts the safe speed at this
section of the highway to 50 percent of the design speed. This drastic reduction of safe
speed resulted in a high accident rate at this section. A new alignment is to be designed
with a horizontal curve to reduce the accident rate. If the safe speed should be increased
to the design speed of the highway, assuming the super elevation will remain the same in
the new section, and the perception-reaction time is 2.5 seconds, the minimum radius of
this curve, in feet, is most nearly:
(A) 1,910
(B) 1,855
© 1,815
(D) 1,795
located at a section of an existing rural highway, which restricts the safe speed at this
section of the highway to 50 percent of the design speed. This drastic reduction of safe
speed resulted in a high accident rate at this section. A new alignment is to be designed
with a horizontal curve to reduce the accident rate. If the safe speed should be increased
to the design speed of the highway, assuming the super elevation will remain the same in
the new section, and the perception-reaction time is 2.5 seconds, the minimum radius of
this curve, in feet, is most nearly:
(A) 1,910
(B) 1,855
© 1,815
(D) 1,795