N
122 Cycles
3 in
(7.5 cm)
1 3/8 in
(3.5 cm)
CONCRETE WASHBOARD ROAD
16 in
(40 cm)
16 in
(40 cm)
16 in
(40 cm)
16 in
(40 cm)
16 in
(40 cm)
3 in
(7.5 cm)
WASHBOARD ROAD
CUTAWAY VIEW
820 ft long x 14 ft wide
(250 m x 3 m)
with sine waves
ROCK ROAD
4 in - 6 in (10-15 cm)
diameter rocks
RIVERBED ROCKS
Loose 8 in (20 cm)
diameter
round rocks
40 ft
(12 m)
JAGGED ROCKS
12 in - 16 in
(30 - 40 cm)
diameter rocks
SERPENTINE
SAND COURSE
24 in deep
(60 cm)
164 ft
(49 m)
STEP UP
STEP DOWN
Concrete Island with
5 in (12.7 cm) high centered
obstructions on two level
surfaces.
BODY TWIST COURSE
Two out-of-phase concrete sine wave
wheel tracks with amplitudes of 2 inches
(50 mm) and 23 ft (7 m) pitch. Eight
sine waves with a smooth entry/exit.
164 ft
(49 m)
207 ft
(63 m)
UNDERGUARD CLEARANCE COURSE
8 ft
(3.6 m)
6 in (15 cm) high pipe caps
in center of concrete sine waves
Pitch from 4 ft - 9 ft (1.2 m - 2.7 m)
with 4 in (10 cm) amplitude.
Not to Scale
GVW = 12,000 lbs (5,455 kgs)
OFF-ROAD DURABILITY COURSES
324 ft
(97 m)
12 ft
(3.6 m)
10 ft
(3 m)
TRANSPORTATION RESEARCH CENTER INC.
R
EAST LIBERTY, OHIO 43319-0367
www.trcpg.com
F-19 0308