HomeMy WebLinkAboutTraffic Report 08-02-19
STEVEN J. FEHRIBACH, P.E.
PRESIDENT
JOSEPH T. RENGEL, P.E.
VICE PRESIDENT
R. MATTHEW BROWN, P.E.
VICE PRESIDENT
8365 KEYSTONE CROSSING, SUITE 201 – INDIANAPOLIS, INDIANA 46240
TELEPHONE (317) 202-0864 – FACISMILE (317) 202-0908
TRANSPORTATION ENGINEERING STUDIES ● TRAFFIC IMPACT ANALYSES
STREET DESIGN ● HIGHWAY DESIGN ● TRAFFIC ENGINEERING
PARKING LOT DESIGN ● TRANSPORTATION PLANNING STUDIES
CONSTRUCTION OBSERVATION ● SITE ENGINEERING
REGISTRATION
INDIANA
ILLINOIS
IOWA
KENTUCKY
MICHIGAN
OHIO
MISSOURI
FLORIDA
MEMORANDUM
DATE: 08/02/2019
TO: Stuart D. Huckelberry
Land Development Manager
Lennar – Indianapolis
FROM: Matt Brown, PE/PTOE
A&F Engineering Co., LLC
RE: Proposed Monon Townhomes Development - Carmel, Indiana
A&F Engineering has conducted a traffic analysis on behalf of Lennar for a proposed townhome
development called “Monon Townhomes” that would be located along Rohrer Road south of
Nevelle Lane in Carmel, Indiana. As part of this analysis, A&F Engineering conducted 24-hour
traffic volume counts, trip generation estimates for the proposed development, assignment and
distribution of generated traffic volumes, turn lane warrant analyses and level of service/capacity
analysis calculations. The study area for this analysis includes the intersection of Rohrer Road &
the Monon Townhomes proposed access drive.
DESCRIPTION OF THE PROPOSED DEVELOPMENT
The subject site is located along Rohrer Road, approximately 400 feet south of Nevelle Lane in
Carmel, Indiana. The proposed development will consist of 64 townhomes. As proposed, the site
will be served by a full access drive along Rohrer Road and an emergency vehicle only access
drive via Autumn Lake Overlook to the south. Figure 1 is an area map showing the location and
general layout of the proposed site.
3
EXISTING TRAFFIC DATA
24-hour traffic volume counts were collected along the segment of Rohrer Road between Nevelle
Lane and Leafy Branch Trail during a typical weekday in July 2019 under good weather
conditions. Based on this count, the existing peak hour traffic volumes were obtained. The AM
peak hour along the segment occurs between 8:00 AM and 9:00 AM and the PM peak hour
occurs between 4:15 PM and 5:15 PM. Table 1 summarizes the existing peak hour traffic
volumes.
Table 1 – Peak Hour Existing Traffic Volumes: Rohrer Rd (BT) Nevelle Rd & Leafy Branch Trail
AM PEAK PM PEAK
NB SB NB SB
40 121 179 84
GENERATED TRAFFIC DATA FROM PROPOSED DEVELOPMENT
An estimate of the generated traffic volumes from the proposed Monon Townhomes
development was conducted per the 10th Edition of the ITE Trip Generation Manual1. Table 2
shows the summarized peak hour generated trips from the proposed development.
Table 2 – Total Generated Trips for Proposed Development
DEVELOPMENT INFORMATION GENERATED TRIPS
LAND USE ITE CODE SIZE AM PEAK PM PEAK
ENTER EXIT ENTER EXIT
MULTI-FAMILY HOUSING 220 64 DU 7 24 25 15
The attached Figures 2, 3 and 4 illustrate the assignment and distribution of generated trips for
the proposed development, the total peak hour turning movement traffic volumes from the
proposed development, and the sum of existing traffic volumes and generated traffic volumes
from the proposed development respectively.
1 Trip Generation Manual, Institute of Transportation Engineers, Tenth Edition, 2017.
7
TURN-LANE WARRANT ANALYSIS
A right-turn and left-turn lane analysis was conducted at the proposed access drive for the sum of
existing traffic volumes and generated traffic volumes from the proposed development. This
analysis showed that neither a left-turn lane nor a right-turn lane is warranted along Rohrer Road
at the access drive. However, a right-turn lane should be considered along Rohrer Road at the
access driveway in order to provide safe movement of traffic into the development.
The turn lane warrants and figures depicting the necessary criteria from the INDOT Driveway
Permit Manual are included as an attachment to this memorandum.
CAPACITY ANALYSIS
The "efficiency" of an intersection is based on its ability to accommodate the traffic volumes that
approach the intersection. It is defined by the Level-of-Service (LOS) of the intersection. The
LOS is determined by a series of calculations commonly called a "capacity analysis". A LOS A
is considered to be the highest (best) grade while LOS F is the lowest (worst) grade. A
capacity/level of service analysis was conducted for the peak hours at the intersection of Rohrer
Road & Proposed Access Drive using the sum of existing traffic volumes and generated traffic
volumes from the proposed development (see Figure 4). The following table summarizes the level of
service results.
Table 4 – Level of Service: Rohrer Road & Proposed Access Drive
MOVEMENT AM PEAK HOUR PM PEAK HOUR
Southbound Left-Turn A A
Westbound Approach A B
Note: The level of service results above are based on the following intersection conditions:
Construction of the access drive with at least one inbound lane and one outbound lane.
Stop-sign control intersection with proposed access drive stopping for Rohrer Road.
Construction of a northbound right-turn lane along Rohrer Road at the access drive.
8
CONCLUSIONS / RECOMMENDATIONS
Based on the data and analysis, it can be concluded that the additional traffic added by the
proposed Monon Townhomes will not significantly impact the surrounding roadway network.
The following proposed intersection conditions are recommended at the intersection of Rohrer
Road and the Monon Townhomes Access Drive:
Construction of the access drive with at least one inbound lane and one outbound lane.
Stop-sign control intersection with proposed access drive stopping for Rohrer Road.
Construction of a northbound right-turn lane along Rohrer Road at the access drive.
5%Left Turns10%Left Turns15%Left Turns20%Left Turns25%Left Turns30%Left Turns35%Left Turns40%Left TurnsWarrant?800 313 256 228 199 171 142 113 84Advancing Volume (Va)123600 410 305 265 225 213 200 187 175Opposing Volume (Vo)45400 510 380 328 275 260 245 230 215Left‐turn Volume2200 640 470 410 350 328 305 282 260Left‐turn %2%100 720 515 453 390 365 340 315 290Advancing Volume (Va)92Opposing Volume (Vo)196Left‐turn Volume8Left‐turn %9%Rohrer Road & Proposed Access Drive ‐ Existing + ProposedOperating Speed (mph)Opposing Volume (veh/h)Advancing Volume (veh/h)30INPUTNONOAMPM5% LT10% LT20% LT30% LT40% LT01002003004005006007008000 100 200 300 400 500 600 700 800Vo ‐Volume OpposingVa ‐Volume AdvancingLeft‐Turn Lane Warranton Two‐Lane Roadway(30 MPH )5% Left‐Turns10% Left‐Turns20% Left‐Turn30% Left‐Turns40% Left‐TurnAMPMLeft‐Turn Not NecessaryLeft‐Turn Not Necessary
Time Met?Total Volume RT VolumeRT Volume50 120Total Volume45600 40RT Volume17700 40Total Volume196Existing + Proposed ‐ Rohrer Road & Proposed Access DriveInputAM NOPM NO20304050607080901001101200 100 200 300 400 500 600 700Right‐Turn Volume During DHVTotal DHV, Vehicles Per Hour, In One DirectionCR 500 W & West Access DriveRT VolumeAMPMRight‐Turn Lane Should Be ConsideredRight‐Turn Lane May Not Be Necessary