Civil Engineering Reference
In-Depth Information
Table 16.3 Reported bene
ts of traf
c signal timing improvements
Action
%
Increase
in speed
% Decrease
in travel time
Unit travel
time savings
min/miles
Other
Source
Curb parking restriction
20
-
30
+25
0.24
-
2.4
-
(B)(A)
Left turn prohibition
15
35
+10
(B)(A)
-
-
-
Left turn lanes
10
20
(B)
-
-
-
-
Reversible lanes (heavy
direction)
20
-
50
-
-
-
(B)
One-way streets
20
40
(B)
(C)
-
-
-
-
25
-
50
Special one-way streets
Manhattan
Fifth avenue
+60
−
37
2.4
-
(C)
Madison avenue
+21
(D)
-
-
-
3rd Lexington 7th, 8th,
ave of the Americas
22
65 %
reduction in
stops
(D)
-
Denver
Broadway-Lincoln
+9
(A)
-
-
-
Notes
(A) Reference [
7
]
(B) Reference [
8
]
Estimates are adapted in part from: Rowan, N.S., Woods, J.P., Stover, V
(a) Alternatives for Improving Urban Transportation
—
A Management Overview Prepared for
FHWA by TTI, Taxes A&M University, 1977
(b) Technical Memorandum 3, Quantifying Measures of Effectiveness, Tri-State TSM Study,
Wilbur Smith and Associates, 1978
(C) Reference [
10
]
(D) Reference [
11
]
Source
Reference [
9
]
16.5.1 Curb Parking Restrictions
Curb parking restrictions can provide congestion relief quickly with minimum costs.
They can apply to one or both sides of the street. Restrictions are normally applied
during busy traf
c periods, but they can sometimes extend throughout the day.
16.5.2 Installation Guidelines
Curb parking restrictions are generally appropriate when the following conditions
apply:
Roadways operate at Service Level E or F
At intersection approaches, at transit stops and at
re hydrant
