HomeMy WebLinkAboutSP202100004 Traffic and Trip Generation 2021-02-25SHIMP ENGINEERING, P.C.
Design Focused Engineering
February 25, 2021
Mr. Adam Moore, P.E.
Virginia Department of Transportation
701 VDOT Way
Charlottesville, VA 22911
RE: SP & ZMA Number Pending Clifton Inn & Collina Farm, TMP 79-23B, 79-23F, 79-24B & 79-
36 Turn Lane Narrative
Dear Mr. Moore,
The proposed Clifton Inn & Collina Farm special use permit and zoning map amendment request
is located on the eastern side of Route 729 (North Milton Road) at the intersection of Route 250
(Richmond Road). According to 2019 VDOT AADT data, Route 729 experiences 6,900 daily trips, with
635 trips occurring in the peak hour. Of the 635 trips, 430 trips travel southbound on Route 729, towards
the site. Current operations of The Clifton include a 52-seat restaurant, 15 hotel rooms, and 200-person
special events; this request would allow for an additional 25 rooms, for a total of 40 rooms, 75-person
special events, and the existing 52-seat restaurant to operate on the Clifton Inn property, and 300-person
special events to occur on the Collina Farm property. See table below for trips generated by the expansion
on the Clifton property:
Use Description
ITE
Quantity
PM
In
Out
Total
Quality Restaurant
(Existing)
931
52 Seats
10
5
15
Hotel
(Proposed 25 Rooms)
310
40 Rooms
2
2
4
Total
12
2
4
Right Turn
2
Left Turn
110
The addition of 25 rooms could add 1 PM peak hour trip and possibly 1 additional left turn.
While the expansion of the hotel use and the existing restaurant use have low PM peak hour trips, special
events that occur on a weekday night would likely necessitate transportation improvements due to the
high volume of existing background traffic. In its existing business operations, The Clifton facilitates
guests of special events to park at Stone -Robinson Elementary School and shuttles guests to the Clifton
property, as The Clifton and Stone -Robinson have had an established, informal parking agreement for
many years. Stone -Robinson Elementary School has existing right -turn and left -turn lanes, for adequate
movement of 450 students throughout the week. As this infrastructure is present and being effectively
utilized, the Owner requests that any weeknight special event with a start time before 6:30 P.M., with
more than 60 guests will park off -site at Stone -Robinson Elementary School to limit left turn movements
into the site as a condition of special use permit approval.
912 E. High St. Charlottesville, VA 22902 1434.227.5140 1 shimp-engineering.com
Please let me know if you have any questions or would like to discuss the special use permit and zoning
map amendment request further. I can be reached at 434-953-6116 or at justingshimp-en ing eering com.
Regards,
Justin Shimp, P.E.
1. VDOT 2019 Traffic Data
N Milton Road
2 lane road
45 mph
0.64-mile segment from 02-732 Milton Road N
to US 250 Richmond Road
K
0.092
D
0.677
AADT
6900
Peak Hour Total
635
Peak Hour Direction A
430
Peak Hour Direction B
205
The above table is the VDOT 2019 traffic data which was used to determine peak hour trips on
Route 729 N Milton Road. For the turn lane warrant analysis, it is assumed peak hour direction A
travels in the northern direction in the morning and in the southern direction in the evenings.
2. Trip Generation
Although ITE Trip Generation is typically used for determining new trips created by proposed
uses, special events are not a studied use of the Trip Generation Manual. Additionally, there are
no comparable uses for special events that could be substituted. The anticipated trip generation
numbers below are informed by the Albemarle County Zoning Ordinance of required parking for
special events. Please refer to the Traffic Impact Narrative Supplement provided with the special
use permit and zoning map amendment request. For 60 guests and 6 employees, there would be a
total of 30 trips into the site [(60/2.5) + 6 = 30].
Use Description
ITE
Quantity
PM
In
Out
Total
Special Events
N/A — see
60 guests
30
30
60
(Collina)
Traffic
Impact
Narrative
Supplement
Right Turn
6
Left Turn
24
3. Warrant Analysis Exhibit
For the following turn lane warrant analyses, the evening scenario was analyzed, as weekday
special events will likely occur in the evening.
With 6 right turns into the site and 211 advancing trips, a right turn lane is not warranted for a
special event of 60 guests.
F-'A
100 .i%:
i:: :i :>:::: -WDTM TURN LANE AND TAPER
so
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X.
p
`': TAPER REOUAEa.�:':�::'?:�t;:�'>.:.
40
jR
S
NO TURN LA-IMS
OR TAPERS REQUIRED
6
ac- — wo soo soo
211
Pt.......AACH TOTAL. VEHICLES PER HOUR
Appropriate Radius required at all Intersections and Entrances (Commercial or Private).
LEGEND
PHV - Peak Hour Volume (also Design Hourly Volume equivalent)
Adiusiment for Riaht Turns
For posted speeds at or under 45 mph. PHV right turns > 40, and
PHV total < 300.
Adjusted right turns = PHV Right Turns - 20
If PHV is not known use formula: PHV = ADT x K x D
K = the percent of AADT occurring in the peak hour
D = the percent of traffic in the peak direction of flow
Note- An average of 1 1% for K x D will suffice.
When right turn facilities are warranted, see Figure 3-1 for design cntena
FIGURE 3-26 WARRANTS FOR RIGHT TURN TREATMENT (2-LANE HIGHWAY)
Rev. 1/15
For the left turn lane in the evening scenario, there would be 454 advancing trips, with 211
opposing trips. The 24 left turns into the site would consist of only 5% of trips on the roadway
and would not warrant a left turn lane.
= 700
a
600
W
J 500
O
> 400
C7
Z
(J) 300
a 211
a zuu
O
0
> 100
U 200 400 600 800 1000
VA AD\ 454 NG VOLUME (VPH)
FIGURE 3-10 WARRANT FOR LEFT TURN STORAGE LANES ON TWO LANE
HIGHWAY