Civil Engineering Reference
In-Depth Information
Fig. 7.6 Bottleneck effect of short auxiliary lanes. a Traffic queue limits access to auxiliary lane.
b Right/left-turns back-up onto main travel lane
Fig. 7.7 Varying lot sizes with frequent driveways contribute to congestion
Multi-leg Intersections: In many communities complex multi-leg intersections
with more than two intersecting streets are the focal point of congestion. For
example, an intersection of three streets requires at least three traf
c signal
phases
—
up to six phases if special phasing for left turns is required (Fig.
7.9
).
