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 first quarter of FY19 showed that the City met the measure for AM and Noon peak times. Improvements to noon peak showed travel times decrease by 20 seconds on average and the AM peak remaining relatively the same. The PM peak failed to meet the measure with an increase in travel time of 13 seconds compared to last quarter. With 1 of the 3 peak times falling below a C Level of Service score, this measure is evaluated as red for the quarter.
Average travel times for Highway 90 between Dairy Ashford and Highway 6 are below:
- AM: 6 minutes 00 seconds (29.4 mph, Level of Service C)
- Noon: 5 minutes 30 seconds (32 mph, Level of Service C)
- PM: 7 minutes 11 seconds (24.6 mph, Level of Service D)
The PM peak is heavily affected by the bottleneck at Highway 6 at US 90 where the number of lanes drop from 4 lanes to 3 lanes on US 90 and heavy Northbound Highway 6 frontage road traffic makes it difficult to reallocate time. To add to this, staff also found that on average 1.2 trains occur during the PM peak per day (on average 6 total trains a week during PM peak). On average, these interruptions are increasing travel times going in the Westbound direction by 48 seconds. Staff will investigate the possibility of modifying the existing traffic pattern in PM peak to help improve traffic flow.
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 traffic goal 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.