Traffic Study4. Projected Traffic
4.1 Site Trip Generation
The traffic volumes projected to be generated by the proposed Cottages at Carmel development were based on data
contained in the Institute of Transportation Engineer's (ITE) Trip Generation Manual, 11th Edition. The development
proposes to construct the following:
• Two -bedroom carriage houses (22 units)
• Two and three -bedroom cottages with garages (67 units)
• Two -bedroom cottages (118 units)
• Three -bedroom townhouses (30 units)
• Three 4-story multi -family residential buildings (110 units)
ITE Land Use #210, Single -Family Detached Housing, ITE Land Use #215, Single -Family Attached Housing, and ITE
Land Use #221, Multi -Family Housing — Mid Rise, were found to best represent site's operation.
Table 4.1 presents the trip generation for the site.
Table 4.1 Peak Hour Site Trip Generation — Cottages at Carmel
2024 Trip Generation (Buildout)
LU 210 — Single Family Detached Housing (55 DUs)
11
32
43
36
21
57
LU 215 — Single Family Attached Housing (182 DUs)
28
61
89
60
45
105
LU 221— Multi -Family Housing— Mid Rise (110 DUs)
8
29
37
26
17
43
Total New Site Trips (Figure 7)
47
122
169
122
83
205
4.2 Trip Generation Comparison
A comparative analysis was performed to determine how the trips generated by the proposed Cottages at Carmel
development would compare to the trips generated by a by -right development of the site under existing zoning. The
by -right development of the site allows for the following land uses:
Table 4.2 Peak Hour Site Trip Generation — By -Right
2024 Trip Generation (Buildout)
LU 210 — Single Family Detached Housing (33 DUs)
LU 215— Single Family Attached Housing (162 DUs)
LU 221— Multi -Family Housing — Mid Rise (120 DUs)
LU 710 — General Office Building (320 kst)
Total New Site Trips
4.3 Trip Distribution
7
20
27
22
13
35
24
55
79
53
40
93
9
32
41
29
18
47
400
55
455
74
362
436
440
162
602
178
433
611
Based on a review of the existing turning movement counts, knowledge of the area roadways, and logical traffic
patterns, the following trip distribution was developed for the site traffic and shown in Table 4.2:
6. Conclusions
Based on the results of the study, the conclusions and recommendations are as follows:
Conclusions:
• In 2024, the Cottages at Carmel development is projected to add 169 new trips during the A.M. peak hour (47
in / 122 out) and 205 new trips during the P.M. peak hour (122 in / 83 out).
• Under 2024 background conditions, projected traffic volumes from two approved nearby developments were
included in this study. the Windward at Legacy Townhomes development (142 dwelling units), which will be
located just south of the subject site; and the Milhaus mixed -use development, which will be located in the
northwest quadrant of the intersection of E. 1461h Street and River Road.
• In 2024, with the addition of the new site traffic, all approaches and movements at the study intersections are
projected to operate at levels of service comparable to background conditions (LOS D or better) during both
peak hours with minimal increases in delay.
• In 2034, with the addition of the new site traffic, all approaches and movements at the study intersections are
projected to operate at levels of service comparable to background conditions (LOS D or better) during both
peak hours with minimal increases in delay.
• E. 146th Street and RIRO Site Driveway
➢ Based on the right turn guidelines in Figure 46-413 of the IDM, the volume of traffic on E. 1461h Street
combined with the projected right turning site traffic volumes, an eastbound right turn lane would be
warranted under 2024 future conditions.
• Community Drive and Hopewell Parkway
➢ Based on the right turn guidelines in Figure 46-4A of the IDM, the volume of traffic on Community
Drive combined with the projected right turning site traffic volumes, a right turn lane would not be
warranted under 2024 or 2034 future conditions.
• Community Drive and Equality Boulevard
➢ Based on the right turn guidelines in Figure 464A of the IDM, the volume of traffic on Community
Drive combined with the projected right turning site traffic volumes, a southbound right turn lane
would be warranted under 2024 background conditions.
➢ Based on the left turn lane guidelines in Figure 464C of the IDM, the volume of traffic on Community
Drive combined with the projected left turning site traffic volumes, a northbound left turn lane would
not be warranted under 2024 or 2034 future conditions.
Recommendations:
• E. 1461h Street and RIRO Site Driveway
➢ Based on the auxiliary lane design guidelines in Figures 46-4H, J and L of the IDM, a 435 foot (385
feet deceleration; 50 feet storage) eastbound right turn lane with a 100-foot taper is needed at this
location.
GHD I Weihe Engineers, Inc. 112591020 1 Traffic Impact Study 14