SR 05:276 - Laserfiche WebLink

traffic metering signal timing and selective capacity improvements at other intersections could result in a net decrease in traffic volumes along Vineyard Avenue. Vineyard A venue at Montevino Drive The intersection of Vineyard Avenue at Montevino Drive is controlled by a 4-way stop. Conditions at the intersection do not meet either the state or federal guidelines for the installation of a 4-way stop or traffic signals. Under Existing plus Approved development conditions, this intersection will operate at an extreme LOS F in the morning and LOS E in the evening as a 4-way stop. There are already long back-ups of westbound traffic in the morning as Ruby Hill parents try to bring their children to school. Residents are both complaining about these delays and the difficulty in getting drivers to stop and yield to pedestrians as other parents try to cross their children at this intersection to meet the westbound bus that stops on the north side of the street. Similar queues had developed during the heavy evening eastbound commute resulting in neighborhood cut-through traffic. The existing stop sign has the effect of metering westbound traffic at about 500 to 900 vehicles per hour and thus creates long queues of cars during those hours when this capacity is exceeded. It also has the effect of eliminating most downstream westbound gaps in traffic as one car leaves the intersection ever four seconds. Replacing the 4-way stop with a traffic signal will likely result in an increase in the number of vehicles travelling along Vineyard A venue as delay is significantly reduced at this intersection. However, the traffic signal will improve pedestrian safety crossing Vineyard A venue and will increase the gaps that occur in eastbound and westbound traffic which will improve overall access and egress to Vineyard A venue from the side streets and driveways within a quarter mile of the intersection. A traffic signal with one approaching through lane in each direction would resule in LOS Band C conditions through Buildout. Reconstructing the intersection a second time to provide a second stop sign controlled westbound lane may be possible in the short term, but this will not address existing pedestrian safety concerns, and will make it very difficult for drivers to enter Vineyard Avenue or pedestrians to cross the street further to the west as gaps in traffic will be vertually non-existant. At Buildout, LOS F conditions would again exist at this intersection even with two stop sign controlled lanes in each direction on Vineyard Avenue at this intersection. Computer simulations of the operation of a traffic signal at this intersection show that only one eastbound and westbound through lane is necessary at the intersection. Eastbound Vineyard A venue would have to be restriped to restore the left turn pocket and provide only one through lane if a signal is built. The existing eastbound merge distance is substandard and only works due to the fact that all merging traffic is moving relatively slowly after having just stopped at the stop sign. This same merge is not possible where traffic may be travelling through the intersection on a green light at 35 MPH. Tawny Drive X:\ADMIN\PGGS\Council 2005\MEETINGl00405\SR 05 276 AttachmentI.doc Page 10