ITE Journal March 2018 - 42

(-6 percent), traffic volumes for the other street types also fell or, in
a few cases, remained essentially flat. Overall, total traffic volume
in the Willow Glen area declined by 2 percent after the road diet,
suggesting that some vehicles may have diverted completely out of
the area to other surrounding neighborhoods or major highways.

counts on both types of Lincoln Avenue locations, though not
for the major streets and neighborhood streets (Table 1). For
example, traffic volumes during the morning peak hours dropped
23 percent at the Lincoln Avenue road diet locations, compared
to an all-day drop of 6 percent. By contrast, the major streets saw
tiny peak-hour volume changes (1 percent AM increase and 2
percent PM decrease) that were similar to the all-day measure for
those locations. Finally, the neighborhood streets saw no change
in morning peak-hour volumes but 6-percent fewer vehicles in the
afternoon peak hours.

Impacts by Time of Day
We analyzed impacts by time of day looking at both peak
hourly volumes and volumes for each hour of the day. Traffic fell
noticeably more during the peak hours than it did for all-day

Table 1. Traffic volumes, pre-and post- road diet, by street type and time period.

15,722 14,761
1,392 1,072
1,246

1,111

Change (%)

Change (#)

Post (#)

Pre (#)

Change (#)

Post (#)

Pre (#)

Neighborhood streets
Change (%)

Major streets
Change (%)

Post (#)

Pre (#)

Change (%)

Change (#)

Post (#)

Pre (#)

Time period
Vehicles per day
Vehicles per
AM peak hour a
Vehicles per
PM peak hour a

Change (#)

Lincoln Avenue -
no road diet

Lincoln Avenue -
road diet

-961 -6% 13,695 13,420
-320 -23% 1,312 1,147

-275 -2% 12,107 12,058
-164 -14%
944
950

-48
6

0%
1%

1,939
187

1,850
187

-89
0

-5%
0%

-134 -12%

-118 -10%

-21

-2%

156

147

-9

-6%

Source: Nixon et al., 2017.3 Note: Green font indicates a drop in volume.

a

1,171

1,053

1,005

984

AM peak = 7 AM - 9 AM; PM peak = 4 PM - 7 PM

Table 2. Speeders traveling 5 or 10 mph above the speed limit, pre-and post- road diet, by street type and time period.

3683

2058 -1625 -44%

1532

1897

365

24%

1571

1946

375

24%

461

536

75

16%

421
30%

190
18%

-231 -55%
-- c
-- c

119
9%

143
12%

25
-c

21%
-- c

117
12%

157
17%

40
--b

34%
--b

45
24%

60
32%

15
-- c

34%
-- c

266
21%

98
9%

-168 -63%
--c
--c

144
12%

182
17%

37
-- c

26%
-- c

131
13%

171
17%

40
--b

31%
-- b

54
35%

60
41%

6
-- c

12%
-- c

877

352

-525 -60%

270

371

101

38%

257

367

111

43%

86

117

31

36%

97
7%

29
3%

-68 -70%
-- c
-- c

16
1%

27
2%

10
-- c

63%
-- c

17
2%

27
3%

10
--b

59%
--b

8
4%

12
6%

4
-- c

53%
-- c

51
4%

10
1%

-42 -82%
-- c
-- c

24
2%

34
3%

10
-- c

42%
-- c

17
2%

26
3%

9
--b

53%
--b

9
6%

11
8%

2
-- c

28%
-- c

Source: Nixon et al., 2017.3 Note: Green font indicates a drop in volume. a AM peak = 7 AM - 9 AM; PM peak = 4 PM - 7 PM.
b
This measure is calculated as the percent of all vehicles travelling during the peak hour that are going 5+ mph over. Table 1 shows the number of vehicles per peak hour, used in the calculation here.

42

Ma rch 2018

Change (%)

Change (#)

Post (#)

Change (%)

Neighborhood streets

Change (#)

Post (#)

Pre (#)

Change (%)

Change (#)

Post (#)

Pre (#)

Change (%)

Change (#)

Post (#)

Pre (#)

Time period
Vehicles 5+ mph over
All day
AM peak houra
# of vehicles
% of vehicles/hourb
PM peak houra
# of vehicles
% of all vehicles
Vehicles 10+ mph over
All day
AM peak houra
# of vehicles
% of vehicles/hourb
PM peak houra
# of vehicles
% of all vehicles

Major streets

Pre (#)

Lincoln Avenue -
no road diet

Lincoln Avenue -
road diet

i te j o urn al

c

Not applicable.



Table of Contents for the Digital Edition of ITE Journal March 2018

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