TM 5-5420-278-10
0036 00
0036 00-4
BRIDGE OPERATION (Contd)
5. Vehicle crossing speed:
Normal and two-lane:
Ramps:
MLC 040:
15 mph (25 kph)
MLC 40 and over:
5 mph (8 kph)
Bridge:
MLC 040:
25 mph (40 kph)
MLC 40 and over:
15 mph (25 kph)
Caution:
5 mph (8 kph), Ramp and Bridge
Risk:
3 mph (5 kph), Ramp and Bridge
6. Vehicle lanes:
Normal:
Anywhere on 14 ft 9 in. (4.5 m) marked
primary roadway
Caution:
On roadway centerline (minimum
eccentricity)
Risk:
On roadway centerline (minimum
eccentricity)
Two-lane:
Anywhere on each parallel 11 ft (3.4 m)
marked roadway
7. Stopping, accelerating, turning, shifting of gears on the bridge is not permitted
during Caution or Risk crossings and should be kept to a minimum during
Normal crossings.
8. For two-lane traffic, ramp plates should be used to aid two-lane traffic on and
off the bridge. Lane traffic should be staggered, with vehicles entering bridge at
a minimum of 50 ft (15 m) intervals into alternate lanes.
WARNING
When performing bridge operations using IFB bays
interconnected with IRB bays, observe IFB tabled data
only (TM 5-5420-209-12). Failure to comply may result
in damage to equipment and injury or death to
personnel.
NOTE
When connecting IFB bays with IRB bays, refer to TM
5-5420-209-12 for operating instructions unique to IFB
bays.
9. When bridges are built with IFB bays intermixed with IRB bays, the bridge
ratings are reduced to IFB bridge ratings. As much as possible within the scope
of a mission, keep the mixing of bays to a minimum, connect all IFB bays
together, and connect all IRB bays together with only one IFB-IRB interface.
Vehicle crossing speeds and vehicle spacing will be identical to those given
above. The following MLC rating table applies whenever IFB bays are
intermixed with IRB bays.