Civil Engineering Reference
In-Depth Information
Fig. 7.14 Inadequate freeway on
—
ramp and acceleration lane
Fig. 7.15 Inadequate freeway exit ramps
maneuvers force through traf
c on the freeway lanes to slow down as well. In
addition there are cases where the length of the exit ramp approaching a traf
c
signal is too short to hold the traf
c queue generated by the signal. This situation
creates backup of queued traf
c into the freeway lanes. Figure
7.15
provides an
example.
Movable Bridge Openings: Streets and roadways sometimes span water bodies
on movable brides. When the watercraft approaches, the bridge is opened to let
the motor craft through and motor vehicle traf
c backups
result as approaching vehicles must wait until the bridge is reopened for their
use.
c is stopped. Traf
