Civil Engineering Reference
In-Depth Information
Table 16.9 Summary of access management bene
ts reported in the case studies
Case study
Reported bene
ts
Location
Description of
improvements
Speeds
Safety
A. Arapahoe
Road Denver.
CO
Access managed roads with
physical medians. Limited
turns 1/2 mile
40 mph in pm
peak hour
compared
4 Acc/million VMT on
arapahoe and 7 Acc/million
VMT
A. Parker Road
Denver. CO
(52 miles)
Traffic signal spacing
With 15
On Parker compared with
up to 13 on other arterials
-
20 mph on
non-access
managed
arterials
B. Oakland Park
Blvd. Ft.
Lauderdale 17
Florida
(2.2 miles)
Physical median extended
across unsignalized
driveways
30 % less
delay
Accident rate declined
about 10 % injury rate
declined 28 %. 30 % fewer
mid-block median
maneuvers after
improvements
C. Jimmy Carter
Blvd. Atlanta,
Georgia (3.0
miles)
Two-way left lanes on 4-
lane road replaced by
physical median; 6 through
lanes and protected left turn
lanes
Speeds
reportedly
increased
32 % drop in accidents and
40 % drop in accident rate
with interim New Jersey
barrier median
C. Memorial Dr.
Atlanta, Georgia
(4.3 miles)
Two-way left lanes on 6-
lane road replaced by
physical median; 6 through
lanes and protected left turn
lanes
40 % drop in accidents and
37 % drop in overall
accident rate. 64 % drop in
left turn accident rate
G. Route
47
—
Vineland.
New Jersey
(1.8 miles)
Four narrow lanes replaced
by two through lanes plus
protected left turn lane
PM peak hour
speeds
declined from
35 to 32 mph
39 % decline in total
accidents. 86 % decline in
left turn accidents
G. Route
130
Median openings closed
and left turn lanes installed
45 % decline in accident
rate
New
Jersey (43 miles)
—
G. Route
23
Jug handles built and road
cut through two rotaries
34 % decline in accidents
New Jersey
(3.9 miles)
—
Source
Reference [
30
]
Examples of these strategies are described below:
ITS traf
c control strategies include a range of applications, including metering
traf
c demands,
non-stop toll collection, metering flow entering the freeway, managing the
response to traf
c, dynamic timing of traf
c signals in response to changing traf
c incidents, or providing real time information to travelers about
traf
c delays, expected travel times, and alternative routes/modes.
