A well designed signal retiming plan covering 8.7 miles resulted in 16,322 hours of travel time savings and 982 tons of CO2 reductions.

Research on traffic signal performance in Indiana.

Date Posted
08/29/2014
Identifier
2014-B00926
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Performance Measures for Traffic Signal Systems: An Outcome-Oriented Approach

Summary Information

In April 2012, a signal retiming project was performed on an 8.7-mile section of US-31 in Kokomo, Indiana. Researchers demonstrated how performance measures can be developed to assess and manage advanced signal systems over time.

Arterial travel time data were collected from crowd source probe vehicle applications one week before and one week after retiming was conducted to improve through-traffic on the corridor. An Indiana DOT counting station estimated average annual daily traffic (AADT) at 26,000 vehicles. The findings below summarize the benefits observed.

FINDINGS

Travel Time savings on US-31 in Kokomo, Indiana

RoadwayPlan
Median Travel Time
Savings (min)
Percentage of Daily
Traffic
Travel Time
Savings (hours)
Travel Time
Savings ($)
CO2
Reduction (tons)
CO2 Reduction
Savings($)
US-31 SB
Plan 0
(12-5 AM)
0.79
2.2%
1,987.30
$46,941.69
16.77
$368.96
Plan 1
(5-9 AM)
1.22
7.2%
9,925.90
$234,453.24
83.76
$1,842.82
Plan 2
(9-11 AM)
1.83
5.3%
10,878.00
$256,941.12
91.8
$2,019.58
Plan 3
(11-1 PM)
1.1
6.7%
8,246.30
$194,779.77
69.59
$1,530.98
Plan 4
(1-3 PM)
0.93
6.6%
6,886.10
$162,653.47
58.11
$1,278.47
Plan 5
(3-7 PM)
1.53
13.5%
23,311.00
$550,620.34
196.72
$4,327.91
Plan 6
(7-12 PM)
0.91
7.1%
7,319.90
$172,898.62
61.77
$1,359.00
US-31 NB
Plan 0
(12-5 AM)
0.58
2.2%
1,462.30
$34,540.02
12.34
$271.49
Plan 1
(5-9 AM)
0.75
7.6%
6,420.30
$151,649.25
54.18
$1,191.97
Plan 2
(9-11 AM)
1.02
5.5%
6,316.60
$149,199.92
53.31
$1,172.72
Plan 3
(11-1 PM)
1.1
7%
8,627.10
$203,775.18
72.8
$1,601.69
Plan 4
(1-3 PM)
1.26
7%
9,881.90
$233,415.21
83.39
$1,834.66
Plan 5
(3-7 PM)
0.69
14.2%
11,041.00
$260,787.26
93.17
$20,149.81
Plan 6
(7-12 PM)
0.45
7.9%
4,018.00
$94,906.91
33.91
$745.97
TOTAL
100%
116,322.00
$2,747,562.00
982
$21,596.03
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