HomeMy WebLinkAboutSP201800011 Study 2018-10-12EPR, P,C. "ENGINEERING 8. PLANNING RESOURCES"
EPRi)(-( 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
MEMORANDUM
TO: COURTNEY PALUMBO
ORGANIZATION: REGENTS SCHOOL
...... ......... ......... ......
PHONE NUMBER:
RE: TRAFFIC ASSESSMENT — REGENTS SCHOOL SITE
FROM: BILL WUENSCH, P.E., PTOE;
WEI HE
DATE: OCTOBER 12, 2018
....... ........... _......_ _ .._._._.
SENDER'S REFERENCE NUMBER:
........
YOUR REFERENCE NUMBER:
❑ URGENT X FOR YOUR USE ❑ PLEASE COMMENT ❑ PLEASE REPLY ❑ PLEASE RECYCLE
The purpose of this memorandum is to summarize a "due diligence" level traffic assessment for
the proposed Regents school site. This document is not expected to be a substitute for a fully
documented traffic impact study, but instead this initial research and analysis was performed to
see if there is an approach to managing traffic while awaiting the ultimate desired diverging
diamond improvements. To accomplish this goal, EPR conducted an assessment of trip
generation potential, and then examined traffic impacts and mitigation strategies to offset the
school's traffic impacts. The following provides a brief summary of this information.
Trip Generation
Two methods were utilized to examine likely trip generation. These include direct calculation
per the ITE Trip Generation Manual, and also a calculation based on actual expected trip making
potential per known historical bus operations, car pooling, and consideration of employees with
students. Trips were calculated for year 2028 with 230 students, and then also for year 2038
with 460 students.
Per the ITE Trip Generation Manual, the trip generation was calculated based on the land use of
private K-12 school and code of 536. Table 1 below summarizes the land use, code, units, and
trips.
Table 1 Trip Generation per the ITE Trip Generation Manual
Unit
AM
AM
AM
PM
PM
PM
Scenario
Land Use
Code
(Students)
Weekday
TOTAL
IN
OUT
TOTAL
IN
OUT
2028
Private K-
(230)
12
536
230
570
186
113
73
133
56
77
2038
Private K-
(460)
12
536
460
1141
373
227
146
267
112
155
Per the actual expected trip making potential, the trip generation was calculated based on the
historical bus operations, car pooling, and consideration of employees with students. The
Attachment 7
EPRo
EPR, P,C. "ENGINEERING & PLANNING RESOURCES"
902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
information that the school provided shows that the current Regents School has 160 students
and 22 full-time and 6 part-time employees. These 160 students are from 94 families, within
which 24 families take the school bus, 49 families car pool, three families have employees of
the school, and 18 families drive individually.
Based on the above student information, the total current student trips are as in Table 2.
Table 2 Current Total Student Trips
Travel Type
Take Bus
Car Pool
Take Employee's
Vehicle
Drive Individually
Total
Families
24
49
3
18
_
94
Trips
1
25
0
18
44
The result as shown in Table 2 indicates that the current 160 students have in total 44 trips and
the rate is 0.275 trips/student. Applying this rate to years 2028 and 2038 results in 63 total
student trips in year 2028 and 127 total student trips in year 2038. It should be noted that
student trips will arrive, drop off, and leave the school in AM and arrive, pick up, and leave the
school in PM.
Based on the above employee information, this memo assumed a daily pattern that full-time
employees and half of the part-time employees will arrive the school in AM and leave the
school in the PM, which results in 25 trips total for the current employees.
This memo assumed that employee student ratio will be the same in years 2028 and 2038.
Table 3 summaries the estimated employees and trips in years 2028 and 2038.
Table 3 Estimated Employees in the Years 2028 and 2038
Year
2018
2028
2038
Students
160
230
460
Full Time Employee
22
32
64
Part Time Employee
6
_
9
18
Trips
25
37
73
Per the above calculation, in year 2028, there will be 63 student trips arriving, dropping off, and
leaving the school in AM and arriving, picking up, and leaving the school in PM and 37
employees arriving the school in AM and leaving the school in PM; in year 2038, there will be
127 student trips arriving, dropping off, and leaving the school in AM and arriving, picking up,
and leaving the school in PM and 73 employees arriving the school in AM and leaving the school
in PM.
Considering school's arriving the leaving pattern, most of the trips will arrive within the school
AM peak hour, but fewer trips will leave within the school PM peak hour while others will have
after school activities. Examining the ITE trip generation pattern, this memo assumed all trips
will arrive within the school AM peak hour and about 71.5% of the trips will leave within the
EPR(( EPR, P,C. "ENGINEERING & PLANNING RESOURCES"
j "}k. 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
school PM peak hour. Table 4 summarizes the estimated trip generation for years 2028 and
2038 per the actual expected trip making potential.
Table 4 Estimated Trip Generation for the Years 2028 and 2038 per the Actually Expected Trip Making Potential
Scenario
2028 AM
2028 PM
2038 AM
2038 PM
In/Out
Inbound
Outbound
Inbound
Outbound
Inbound
Outbound
Inbound
Outbound
Student
Trips
63
63
45
45
127
127
91
91
Employee
Trips
37
0
0
27
73
0
0
52
Total
Trips
100
63
45
72
200
127
91
143
Comparing the two methods, the one per the actual expected trip making potential is based on
the Regents School and can be considered as more accurate for this analysis. The ITE Trip
Generation is based on a wide variety of school types withing varying land use contexts. Thus,
the analysis for Regents will use the trip generation method per the calculated (actual)
expected trip making potential for the following analysis.
Background Traffic
The background AM and PM peak hour traffic counts at the two ramp intersections with
Fontaine Avenue were taken from a recent traffic study performed by VHB for VDOT for the
diverging diamond interchange. Also, growth rates from that same report were utilized for this
analysis. The following figures illustrate the existing, year 2028, and year 2038 AM and PM
peak hour traffic counts.
Figure 1 Existing Traffic Volumes
"ENGINEERING & PLANNING RESOURCES"
EPRr902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
Figure 2 2028 No Build Traffic Volumes
.AM 295E 29$6 tJ Nw.
it
'A L Jig 363 37LJ12 2i0 ✓r 1111 Ilia
54
SHI ~ 43110 16 • !29 -6 90 267
•rr • 2936 29 M
Figure 3 2038 No Build Traffic Volumes
'•M1'. >fi r.fi PM 29SO 29M
L .:r.s 73 u3 39 L 767
Jai it r J°' tat 9>J IV r
,11 raaame v,me. co,a:.
Site Trip Distribution and Assignment
Trip distribution is based on consideration of trip patterns at Regents school in a previous study,
and also consideration of population distribution throughout the region. The following
illustrates the assumed trip distribution. It should be noted that 2% of the trips (2 trips in year
2028 and 4 trips in year 2038) were assumed from/to the local residential area along
Buckingham Circle, Reservoir Road, and Foxhaven Farm
Figure 4 Site Trip Distribution
. 0 ~■ L U ■ 0 F to
nK "9n am six a~� z•,w '� `1 r0 47-
The site trips were assigned to the road network based on the trip generation and the
distribution as noted above. The build condition site trips for both year 2028 with 230 students
and year 2038 with 460 students are shown below.
Figure 5 2028 Site Trips
EPEPR, P,C. "ENGINEERING & PLANNING RESOURCES"
902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
1b)c,1hI 29SO St
..J L, r a .. J L. r6
14 r ,� -► ,B 4le
1 16 ~ B 34 19 0
MSB 016
Figure 6 2038 Site Trips
?M Z95B I9 NE PM ]956 39 NB
6.11 4 r 9 J a. jr 9 ..
6
93 +~y 6D ■ r 73 3 r *1 F
11 i 7� q f7 ?' ~
-., . VLF - .4 •Jp
Build Condition Traffic Volumes
Combining the background traffic with the site trips as previously shown, the following
illustrates the build condition traffic volumes. It should be noted that in build conditions only
AM traffic volumes were shown, since the school traffic is very minimal in the regular PM peak
hour (i.e. 4:30 to 6:OOPM).
Figure 7 2028 Build Traffic Volumes
*J L r m a ua
�...: K
• e7 - "1 r
• eo ac
Figure 8 2038 Build Traffic Volumes
AM
EPR, PC. "ENGINEERING & PLANNING RESOURCES"
EPRPc 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
4.1 V 1r 25) 1 «
t;s 56 7 A: •, ,� i, ti r
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Traffic Analysis
The no build and build condition traffic was analyzed as needed to compare future build
conditions with future no build conditions. The worst impacts were found to be at the
southbound ramp, thus various mitigation strategies were examined including:
• Adding an exclusive right turn lane to the southbound ramp
• Adding an exclusive westbound left turn lane at the southbound ramp and an additional
westbound through lane at the northbound ramp.
• Signalizing the southbound ramp (with no additional lanes)
• Signalizing the southbound ramp and adding an exclusive right turn lane to the
southbound ramp, adding an exclusive westbound left turn lane at the southbound
ramp and an additional westbound through lane at the northbound ramp
For the signalized scenario, the future no build PM traffic volumes were analyzed with the
signalized configuration to test to see if there were adverse impacts or if the signal could also
work in the regular PM.
The following tables summarize the traffic analysis results per the following scenarios:
1. AM Existing; conditions
Existing AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SIB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.3
A/2.1
C/16.3
B
Approach LOS/Delay
A/1.3
A/2.1
C/16.3
11.1
Movement Queue
0
51
316
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.0
A/0.9
A/0.3
I A/3.3
A/9.6
A/7.4
A
Approach LOS/Delay
A/1.1
A/2.2
A/7.4
4.6
Movement Queue
29
0
0
48
61
0
EPR, PAC. "ENGINEERING & PLANNING RESOURCES"
,EPRi 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
2. AM Year 2028 no build conditions
Year 2028 No
Build AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.5
A/2.3
E/45.4
D
Approach LOS/Delay
A/1.5
A/2.3
E/45.4
30.1
Movement Queue
4
57
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.1
I A/1.0
A/0.4
I A/3.6
B/11.7
A/9.5
A
Approach LOS/Delay
A/1.2
A/2.4
A/9.6
5.7
Movement Queue
31
0
0
72
58
0
3. AM Year 2028 build conditions (230 students)
Year 2028 Build AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.7
A/2.7
F/115.7
F
Approach LOS/Delay
A/1.7
A/2.7
F/115.7
64.5
Movement Queue
8
73
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.4
A/1.0
A/0.6
A/3.9
B/13.2
A/9.5
A
Approach LOS/Delay
A/1.2
A/2.6
A/9.8
5.9
Movement Queue
42
1 0
0
1 ill
76
0
4. AM Year 2028 build conditions (230 students) with an exclusive right turn lane at the
southbound ramp
Year 2028 Mitigation #1 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL
SBR
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.8
A/2.7
F/113.6
13/12.2
F
Approach LOS/Delay
A/1.8
A/2.7
F/103.5
59.0
Movement Queue
9
75
> 500
> 300
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.3
A/1.0
A/0.6
A/3.9
13/13.7
A/9.5
A
Approach LOS/Delay
A/1.3
A/2.6
A/9.8
5.9
Movement Queue
37
1 0
0
1 125
80 1
0
EPR, PAC. "ENGINEERING & PLANNING RESOURCES"
EPRj)c 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
AM Year 2028 build conditions (230 students) with an exclusive right turn lane at the
southbound ramp and ar exclusive westbound left turn lane at the southbound ramp
(i.e. WBL and WBT versus the shared lane) and an additional westbound through lane at
the northbound ramp
Year 2028 Mitigation 82 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL
WBT
SBL
SBR
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.9
A/2.9
I A/0.5
F/79.4
D/31.0
F
Approach LOS/Delay
A/1.9
A/2.0
F/74.5
43.4
Movement Queue
1
67
0
> 500
> 300
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.3
A/1.0
A/0.8
A/4.2
B/14.8
A/9.6
A
Approach LOS/Delay
A/1.3
A/2.9
A/9.9
6.0
Movement Queue
40
4 j
2 1
151
85 1
0
6. AM Year 2028 build conditions (230 students) with traffic signal at southbound ramp
intersection
Year 2028 Mitigation #3 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/8.0
C/15.4
B/15.0
B
Approach LOS/Delay
A/8.0
C/15.4
B/15.0
14.3
Movement Queue
87
208
340
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.6
I A/1.2
A/0.6
A/4.0
B/14.5
A/9.5
A
Approach LOS/Delay
A/1.5
A/2.6
A/9.9
5.9
Movement Queue
42
0
0
163
89
1 0
7. AM Year 2038 no build conditions
Year 2038 No Build AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.5
A/2.5
F/115.1
F
Approach LOS/Delay
A/1.5
A/2.5
F/115.1
59.1
Movement Queue
0
64
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.5
A/1.0
A/0.5
I A/4.3
B/15.0
8/12.5
A
Approach LOS/Delay
A/1.2
A/2.9
B/12.6
7.5
Movement Queue
38
0
0
129
64
0
EPWcEPR, PAC. "ENGINEERING & PLANNING RESOURCES"
902 E JEFFERSON ST. UNIT 101 CHARLOTTESVILLE VA 22902
8. AM Year 2038 build conditions (460 students)
Year 2038 BuOd AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.8
A/3.5
F/175.7
F
Approach LOS/Delay
A/1.8
A/3.5
F/175.7
69.7
Movement Queue
13
102
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.6
A/0.9
A/0.8
A/4.8
C/17.6
B/13.0
A
Approach LOS/Delay
A/1.3
A/3.1
B/13.4
8.3
Movement Queue
42
1 0
6
1 200
110
1 0
9. AM Year 2038 build conditions (460 students) with an exclusive right turn lane at the
southbound ramp
Year 2038 Mitigation #1 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL
SBR
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.8
A/2.7
F/189.3
C/18.8
F
Approach LOS/Delay
A/1.8
A/3.5
F/167.4
68.9
Movement Queue
11
108
> 500
> 300
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.8
A/0.9
A/0.8
A/4.8
C/17.8
I B/13.1
A
Approach LOS/Delay
A/1.3
A/3.1
B/13.5
8.4
Movement Queue
48
0
6
165
114
0
10. AM Year 2038 build conditions (460 students) with an exclusive right turn lane at the
southbound ramp and an exclusive westbound left turn lane at the southbound ramp
(i.e. WBL and WBT versus the shared lane) and an additional westbound through lane at
the northbound ramp
Year 2038 Mitigation #2 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL
WBT
SBL
SBR
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/1.9
A/3.5
A/0.6
F/156.7
F/72.5
F
Approach LOS/Delay
A/1.9
A/2.2
F/145.4
63.7
Movement Queue
6
79
1 6
> 500
> 300
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/3.7
A/1.0
A/1.2
I A/5.4
C/18.2
B/13.0
A
Approach LOS/Delay
A/1.3
A/3.6
B/13.5
8.4
Movement Queue
47
1 2
0 1
190
110
1 0
PWC
EPR, P,C. "ENGINEERING & PLANNING RESOURCES"
E902 E JEFFERSON ST. UNIT 101 CHARLOTTESVILLE, VA 22902
11. AM Year 2038 build conditions (460 students) with traffic signal at southbound ramp
intersection
Year 20M Mitigation #3 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
B/10.8
D/33.3
F/51.2
E
Approach LOS/Delay
B/10.8
D/33.3
F/51.2
39.6
Movement Queue
128
405
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/4.7
I A/1.6
A/1.0
I A/6.2
D/27.9
B/13.1
A
Approach LOS/Delay
A/2.0
A/4.0
B/14.5
8.6
Movement Queue
67
0
6
263
147
0
12. AM Year 2038 build conditions (460 students) with traffic signal at southbound ramp
intersection and with an exclusive right turn lane at the southbound ramp, an exclusive
westbound left turn lane at the southbound ramp (i.e. WBL and WBT versus the shared
lane) and an additional westbound through lane at the northbound ramp
Year 2038 Mitigation #4 AM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL
WBT
SBL
SBR
1. Rte 29/Fontaine SB
Movement LOS/Delay
C/19.8
C/19.5
B/12.2
C/18.1
A/6.1
C
Approach LOS/Delay
C/19.8
C/16.1
C/16.5
16.8
Movement Queue
149
195
149
402
1 255
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WBR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/4.4
A/1.6
A/1.2
A/6.2
D/25.1
B/12.8
A
Approach LOS/Delay
A/2.0
A/4.1
B/14.0
8.4
Movement Queue
59
1 0
34
1 234 1
141 1
0
EPR, P,C. "ENGINEERING & PLANNING RESOURCES"
EPRt)c1' 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
13. PM Year 2028 build conditions (230 students) with traffic signal at southbound ramp
intersection. No school traffic was added and PM Year 2028 no build condition traffic
volumes were used since the school traffic is very minimal in the PM peak hour (i.e. 4:30
to 6:OOPM). This analysis is just to see if there were adverse impacts or if the signal
could also work in the background PM peak hour.
Year 2028 Build PM
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 SB
Overall
EBT/R
WBL/T
SBL/R
1. Rte 29/Fontaine SB
Movement LOS/Delay
A/6.4
E/47.6
F/181.7
F
Approach LOS/Delay
A/6.4
E/47.6
F/181.7
78.0
Movement Queue
80
> 500
> 500
Movement/Approach
Fontaine EB
Fontaine WB
Rte 29 NB
Overall
EBL
EBT
WBT
WEIR
NBL
NBR
2. Rte 29/Fontaine NB
Movement LOS/Delay
A/6.9
A/1.3
F/88.7
D/25.1
F/652.5
I A/5.8
F
Approach LOS/Delay
A/2.0
F/65.9
F/70.8
54.7
Movement Queue
52
0
> 1000
> 10 00
262
207
Findings
1. The additional lanes by themselves do not get the LOS/delay/queuing back down to
a level equaling the no build conditions
2. In year 2028, the traffic signal at the southbound ramp does work well in the
morning as a mitigation measure. However, it does not work in the PM peak hour
traffic due to the very high left turn volume accessing the southbound on -ramp.
3. In year 2038, the traffic signal at the southbound ramp does get the
LOS/delay/queuing back down to a level equaling the no build conditions in the
morning; however, in order to get the traffic working well in the morning, the
mitigation measure should include the traffic signal at southbound ramp
intersection with an exclusive right turn lane at the southbound ramp, and an
exclusive westbound left turn lane at the southbound ramp (i.e. WBL and WBT
versus the shared lane) and an additional westbound through lane at the
northbound ramp. The same as in year 2028, it does not work in the PM peak hour
traffic due to the very high left turn volume accessing the southbound on -ramp.
4. If the signal were to be operated as an actuated signal in the AM peak hour, and
then put into flash mode for the PM peak hour, traffic conditions could be
manageable in year 2028, although this traffic signal scheme is not typically used.
5. In year 2038, the signal should be combined with an exclusive right turn lane at the
southbound ramp and an exclusive westbound left turn lane at the southbound
ramp (i.e. WBL and WBT versus the shared lane) and an additional westbound
through lane at the northbound ramp to maintain the traffic conditions manageable.
Note that this only works for the AM peak hour and the PM peak hour would need
to be in flash operation.
EPR, PAC. `ENGINEERING & PLANNING RESOURCES"
FPRj)( 902 E JEFFERSON ST. UNIT 101, CHARLOTTESVILLE, VA 22902
The FHWA MUTCD notes:
Section 4D.28 Flashing Operation of Traffic Control Signals — General Standard:
01 The light source of a flashing signal indication shall be flashed continuously at a rate of not
less than 50 or more than 60 times per minute.
02 The displayed period of each flash shall be a minimum of 112 and a maximum of 213 of the
total flash cycle.
03 Flashing signal indications shall comply with the requirements of other Sections of this
Manual regarding visibility -limiting or positioning of conflicting signal indications, except that
flashing yellow signal indications for through traffic shall not be required to be visibility -limited
or positioned to minimize visual conflict for road users in separately controlled turn lanes.
04 Each traffic control signal shall be provided with an independent flasher mechanism that
operates in compliance with this Section.
05 The flashing operation shall not be terminated by removal or turn off of the controller unit or
of the conflict monitor (malfunction management unit) or both.
06 A manual switch, a conflict monitor (malfunction management unit) circuit, and, if
appropriate, automatic means shall be provided to initiate the flashing mode.
Option: 07 Based on engineering study or engineering judgment, traffic control signals may be
operated in the flashing mode on a scheduled basis during one or more periods of the day rather
than operated continuously in the steady (stop -and -go) mode.
Going forward, the concept of a temporary traffic signal installation (while awaiting the full
interchange improvements if funded) operating in stop-go mode in the AM peak hour and
flashing operation all other hours of the day for year 2028.
Looking out to year 2038 would require the signal combined with an exclusive right turn lane
at the southbound ramp and an exclusive westbound left turn lane at the southbound ramp
(i.e. WBL and WBT versus the shared lane) and an additional westbound through lane at the
northbound ramp.
Depending on the outcome of that coordination, full traffic impact study documentation can
be prepared.
CC: Ashley Davies — Williams Mullen
Valerie Long —Williams Mullen
Justin Shimp—Shimp Engineering