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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