Civil Engineering Reference
In-Depth Information
Listing
fl
flooded routes on websites
Reducing speed limit with Variable Speed Limit (VLS) signs and modifying
traf
c signal timing
15.4.2 Demand Strategies
Demand strategies include actions intended to give guidance to drivers on the safe
use of roadways during adverse weather conditions:
Issuing travel advisory information to drivers about weather events (snow, ice,
fog) in speci
c areas or roadways to minimize crashes.
Listing
fl
flooded routes on web sites to direct drivers to alternate routes
Establishing control strategies that permit or restrict traffic flow and regulate
roadway capacity
15.5 Work Zones
Work zones account for up to 19 % of delay in large urban areas and up to 27 % of
delay in small urban areas. The degree to which work zones impact traf
c speed
depends upon the length of time the work zone is in place, the number of lanes
closed or detoured by the work zone, and the hours when the work is performed,
and driver awareness of the work zone.
15.5.1 Supply Strategies
Supply strategies include:
reducing the time to complete the work
scheduling the work during off peak hours
maintaining roadway capacity (e.g., temporary contra-
fl
ow lanes)
providing breakdown (shoulder) lanes
maintaining safe work practices
providing alternate routes
15.5.2 Demand Strategies
Demand strategies include:
posting safe speed limits
real-time monitoring of traf
c speeds
