ITE Journal - May 2020 - 42
Table 1. Summary of Surveyed Streets.
Street
Direction
Central Avenue
No. of
Lanes/Dir
Street
Land Use
Classification
Speed Limit
Remarks
Northbound 1
Southbound
Local
Single-family Residential
25
36' to 40' wide with on-street
parking
Civic Center Drive
Westbound
1
Minor arterial
Public use, Single-family
Residential, and Office
25
32' wide with on-street parking on
one side
Hamilton Avenue
Eastbound
Westbound
3
Major arterial
Multi-family Residential
and Commercial
35; 25 when children 100' wide with on-street parking
are present
on one side, bike lane on other side
McCoy Avenue
Eastbound
1
Collector
Single-family Residential
25
40' wide with on-street parking
Victor Avenue
Northbound 1
Southbound
Local
Single-family Residential
25
40' wide with on-street parking
Virginia Avenue
Northbound 1
Southbound
Collector
Single-family Residential
25
40' wide with on-street parking;
bike route
Procedure and Data Analysis
Each sign records date- and time-stamped speed data retrieved,
periodically, by city staff. For the "before" survey period signs
were operated in "stealth mode" (i.e., data collected but speeds not
displayed) so that recorded vehicle speeds would not be influenced
by the signs. For the "after" survey periods signs were operated in
"active mode" (i.e., speeds displayed).
Data were edited to eliminate various types of data artifacts.
Average speeds for each "before" and "after" survey period were
calculated for each street.
Findings
Table 2 and Figure 2 show average speeds for each sign location
at various times from September 2013 ("before") and increments
"after"-three months, six months, one year, three years, and five
years ("after"). The "before" mean speed was 25.6 mph for the street
segments. The following summarizes changes in mean speed in
mph and percentage difference relative to "before" speeds when
signs operated in "stealth mode" (i.e., data collected but speeds not
displayed) so that recorded vehicle speeds would not be influenced
by the signs).
After 3 months, mean speeds averaged a 0.5 mph (0.8 km/hr)
decrease with mean speed changes ranging between a 1.2 mph (1.9
km/hr) decrease and a 0.0 mph increase. Percentage differences
averaged a 1.9 percent decrease and ranged between a 4.6 percent
decrease and a 0.2 percent increase; after 6 months mean speeds
averaged a 0.4 mph (0.6 km/hr) decrease and ranged between a 0.1
and 1.1 mph (0.1 and 1.8 km/hr) decrease. Percentage differences
averaged a 1.8 percent decrease and ranged between a 0.2 and 5.6
percent decrease. Streets experiencing an immediate impact were
eastbound McCoy Avenue and both directions of Victor Avenue.
Both streets are 40 ft. (12 m) wide with on-street parking in each
35
- Civic Center Drive
- EB Hamilton Ave
- EB McCoy Ave
- NB Central Ave
- NB Victor Ave
- NB Virginia Ave
- SB Victor Ave
- SB Virginia Ave
- WB Hamilton Ave
- WB San Tomas
Aquino Road
Speed, mph
30
25
20
Figure 1. Radar Speed Feedback Sign Locations.
42
May 2020
i te j o urnal
Sept. 13 Dec. 13 Mar. 14 June 14 Oct. 14
Jan. 16 Nov. 16 Dec. 17 Aug. 18
Figure 2. Radar Speed Feedback Signs Before/After Average Speeds.
ITE Journal - May 2020
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