Master Transportation Plan Medium-Term Modeling Analysis
counts. • Operational Modeling : Using Synchro 12 and the HCM 7th Edition, turning movement counts were tested under existing, no-build, and build conditions. LOS A–D was considered acceptable, while LOS E and F were considered failing 1 . • Field Verification : Existing conditions were validated with field counts collected in July 2025 to establish baseline peak-hour performance. • Alternative Testing : Multiple control types and geometric configurations were tested, with the intent of identifying feasible short- to medium-term improvements that align with available right-of-way, funding cycles, and freight movement needs.
4.1 Old Denton Road & Westport Parkway
Old Denton Road and Westport Parkway is four legged, a two-way stop controlled intersection with both northbound and southbound approaches along Old Denton Road are stop controlled. This intersection is located approximately 0.6 miles east of the IH-35 and Westport Parkway Interchange. Both Old Denton Road and Westport Parkway are minor arterials and have two lanes with one lane in each direction operating at 40 mph. 4.1.1 Existing and Forecast Conditions Directional ADTs for 2026, 2036, and 2050 were extracted from the NCTCOG model and converted to peak-hour turning-movement counts using Replica-derived 2024 distributions and a K-factor of 10 percent. Field data collected July 29–30, 2025, identified critical peak hours of 6:45 - 7:30 AM and 3:30 - 4:30 PM. Under existing conditions, the intersection currently operating under two-way stop control (TWSC) functions acceptably in the AM peak (HCM LOS C / Synchro LOS A) but experiences substantial PM peak delay (HCM LOS F / Synchro LOS D). 4.1.2 No-Build Operations For 2026, 2036, and 2050, no-build conditions retain the existing geometry. HCM analyses show LOS F for all three forecast years, indicating severe operational degradation as regional volumes increase. 4.1.3 Build Alternatives A set of alternatives was developed and tested for 2036 and 2050 build scenarios under both two-way top control (TWSC) and signalized control conditions. The results of the alternative analysis are shown in Table 5 and Table 6.All TWSC alternatives resulted in failing operations (LOS F) under forecast volumes, reflecting significant delay on the minor-street approaches due to heavy conflicting flows on Old Denton Road. Conversely, the signalized alternatives consistently achieved LOS B in both HCM 7th
1 A stop-controlled intersection at LOS E/F may still operate acceptably if delays are manageable and supported by engineering judgment.
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