Traffic - Corridor US Highway 90 Performance
Great Place To Live
Status Indicators: Proceeding as Anticipated | Monitoring Progress | Reviewing for Improvement | Information Unavailable
Proceeding as Anticipated
Reviewing for Improvement
The results for the 4th quarter of FY19 show that the City met the level of service for all reported peak times. Although Noon & PM peaks showed similar times compared to the 3rd quarter, the AM peak showed a small travel time increase of 14 seconds, which caused the level of service to drop from a B to C. The most probable reason for the travel time drop in the AM peak is due to the Dairy Ashford road construction. Signal times on US 90 had to be adjusted to account for loss of capacity on the Dairy Ashford road. Staff will continue to monitor closely and make adjustments as necessary to make sure the system is optimized based on traffic demands.
During the 4th quarter, the average weekday traffic for SH 6/US 90, US 90/Eldridge, and US 90/Dairy Ashford decreased from approximately 77,860 to 76,610 vehicles per day (vpd) compared to the 3rd quarter. The overall traffic system for US 90 experienced a small increase in train interruptions during the AM peak, 1.7 trains per hour versus 1.8 trains per hour compared to the 3rd quarter. The US 90 travel times are heavily affected by adjacent train lines. Staff will continue to monitor train activity and work to find ways to minimize effect of interruptions.
Average travel times for Highway 90 between Dairy Ashford and Highway 6 are below:
- AM: 5 minutes 19 seconds (33.2 mph, Level of Service C)
- Noon: 5 minutes 30 seconds (32 mph, Level of Service C)
- PM: 6 minutes 27 seconds (27.3 mph, Level of Service C)
Each peak time has a target of C, which means the City aims to have traffic flowing at a minimum of 51-67% of the speed limit. For US Highway 90, this means the City aims to have a traffic goal of at least 25 - 34 MPH during the AM, noon, and PM peak travel times.
Per the 2010 Highway Capacity Manual, this metric is calculated as the average measured travel speed over the posted speed limit for the corresponding major corridor (avg. speed / posted speed limit). The calculated value is converted into a percentage and translated into a letter grade indicative of a level of service (A is the best, F is the worst). This measurement is attained for the AM peak (7-8 AM), Noon Peak (12-1 PM), and the PM peak (5-6 PM), when the major travel corridors in the City of Sugar Land typically experience high travel demands. The slower the measured speed compared to the posted speed limit, the lower the Level of Service.
Measured major travel corridors include:
State Highway 6 (Dulles to Brooks St.) - 45 MPH
US Highway 90 (Dairy Ashford Blvd. to SH 6) - 50 MPH
Standard Levels of Service are classified by the 2010 Highway Capacity Manual.
A: ≥86% B: 68%-85% C: 51%-67% D: 41%-50%
E: 31%-40% F: ≤30%
A target of C means the City aims to have traffic flowing at a minimum of 51-67% of the speed limit. For US Highway 90, this means the City aims to have a traffic goal of at least 25 - 34 MPH during the AM, noon, and PM peak travel times.
The City of Sugar Land's most vital vehicular travel corridors support commercial enterprise and quality of life. Shorter travel times help improve both commercial enterprise and quality of life.