Civil Engineering Reference
In-Depth Information
areas; eliminating parking along roadway; constructing frontage roads to serve local
business traf
c and enhancing nearby intersections.
NCHRP Report 420, Impact
and Access Management Techniques
provides a comprehensive list and assessment
of these techniques [
4
]. The Access Management Manual [
27
] gives further guid-
ance on the use and bene
ts of access management in traf
c operations.
16.10.1 Basic Principles
Several basic principles underlie access management as a strategy for reducing
congestion and improving traf
c safety. They are brie
fl
y described below:
Limit (or prohibit) direct property access along higher type roads
Provide a specialized roadway system in which different roads serve different
travelers and goods movement needs relative to accessibility and mobility.
Figure
16.6
shows an example of the hierarchy
freeways emphasize high
speed travel and are designed with complete control of access (to the freeway);
local roads emphasize low speed movement whose functions are designed to
provide access to land and buildings; while arterials must serve both movement
and property access.
—
Preserve traffic signal coordination
—
locate signals only where they fit in the
traf
c signal coordination plan
Locate access drives away from intersections in order to minimize traf
c con-
fl
flicts and crashes
Fig. 16.6 Functions and
access control of various road
types.
Source
Reference [
5
],
p 50. Figure 6.1
