2011_0808_packet - Laserfiche WebLink

Home

Debra Bloom,, P.E. July 13, 2011 City of Roseville Page 15 Capacity analysis results identify a Level of Service (LOS)�, which indicates how well an intersection is operating. The LOS results are based on average delay per vehicle. Intersections are given a ranking from LOS A through LOS F. LOS A indicates the best traffic operation and LOS F indicates an intersection where demand exceeds capacity. In the Twin Cities metropolitan area,, LOS A through D is generally considered acceptable by drivers. For side-street stop controlled intersections,, special emphasis is given to providing an estimate for the level of service of the minor approach. Traffic operations at unsignalized intersections with side-street stop control can be described in two ways. First, consideration is given to the overall intersection level of service. This takes into account the total number of vehicles entering the intersection and the capability of the intersection to support those volumes. Second, it is important to consider the delay on the minor approach. Since the mainline does not have to stop,, the majority of delay is attributed to the side-street approaches in most cases. Table 2 presents the level of service criteria for signalized and unsignalized intersections. T'abl�e 2, Legal of Service Criteria for Sii gnal�iized and Unsi'gnalized Intersections Level of Service Average Delay per Vehicle [seconds] Signalized Intersections Unsignalized Intersections A < 10 < 10 B 10-20 10-15 C 20-35 15-25 D 35-55 25-35 E 55-80 35-50 F > 80 > 50 (1) Stop-controlled intersection LOS criteria are the swine for side-street and all-way stop controlled intersections. Results of the year 2011 operations analysis shown in Table 3 indicate that all key intersections currently operate at an acceptable overall LOS A during the p.m. peak hour with existing traffic control and geometric layout. All side-street delays are considered acceptable and do not require mitigation. With year 2011 traffic volume levels and the County Road C2 connection, all key intersections will continue to operate at an acceptable overall LOS A during the p.m. peak hour with existing traffic control and geometric layout. Side-street delays will increase at the County Road C2 intersections with Lexington Avenue North and Hamline Avenue North. However, the increase in side-street delays is considered acceptable and does not require mitigation. Therefore,, from an operations perspective, the potential County Road C2 connection does not significantly impact area intersection operations.