RDA Reso 2000-004 - Laserfiche WebLink

Home

• • Signal Warrant Analysis Caltrans' peak hour signal warrants (urban) were used to evaluate whether traffic signals are needed at the unsignalized intersection of Davis Street/Carpentier Street. Based on the estimated p.m. peak hour volumes, it was determined that traffic signals are warranted at this intersection under the Existing plus Project Scenario. However, as shown in Table III, the intersection as a whole is expected to operate at acceptable levels of service as a two-way STOP controlled intersection with a westbound Davis Street left-turn lane and a southbound Carpentier Street right-turn lane. Traffic signals would reduce this delay and thus improve the intersection level of service to LOS A during both the a.m. and p.m. peak hours. However, this intersection is approximately 300 feet west of the signalized intersection of Davis Street/San Leandro Boulevard. Therefore, if it were signalized, it would need to be coordinated with the signal at Davis Street/San Leandro Boulevard. Furthermore, since Davis Street is a State Route, Caltrans would need to approve the installation of a signal. Project Impacts at I-880 Intersections The project is expected to generate approximately 15 a.m. peak hour and 100 p.m. peak hour westbound trips on Davis Street west of Douglas Drive/Pierce Avenue. 45% of these trips are expected to go on the northbound I-880 on-ramp, which results in 7 (=45 x 45%) a.m. peak hour project trips and 45 (= 100 x 45%) p.m. peak hour project trips. Similarly, 45% of the westbound project trips are expected to go on the southbound I-880 on-ramp, which results in 7 a.m. peak hour project trips and 45 p.m. peak hour project trips. These small amounts of project trips will not have a significant impact on either the northbound or southbound I-880 on-ramps. Only 8 (=15 x 55%) a.m. peak hour project trips and 55 (= 100 x 55%) p.m. peak hour project trips are expected to be on the westbound Davis Street approach to the signal at the I-880 northbound off- ramp. This average arrival rate of approximately one vehicle per minute during the p.m. peak hour will not significantly impact the Davis Street/I-880 Northbound off-ramp intersection. Furthermore, only 1 (=15 x 10%) a.m. peak hour project trip and 10 (=100 x 10%) p.m. peak hour project trips are expected to be on the westbound Davis .Street approach to the signal at the I-880 southbound off- ramp. These project trips will have little or no impact on the operations of this intersection. ..._ - ~: 1 San Leandro Creekside Plaza Business Park Traffic Study Page 13 TJKM Transportation Consultants October 26, 1999