McAllen Traffic Impact Analysis (TIA)

The City of McAllen requires a Traffic Impact Analysis when a development's projected traffic is greater than 100 trips during the morning or afternoon peak hour. To determine whether that threshold is met, developers first submit a Trip Generation Worksheet, which the City's Engineering Department reviews as part of the subdivision approval process alongside stormwater drainage compliance.

If a full study is required, it must address the trip generation, distribution, intersection operations, and any turn-lane or access improvements the development triggers. Driveway locations must also conform to the City's Access Management Policy. Gradient Systematics completes the Trip Generation Worksheet first so you know whether a TIA is required — and at what scope — before final plat approval from the Planning and Zoning Commission.

The Rio Grande Valley is one of the busiest land-trade gateways in the United States, and that shapes nearly every regional traffic study. The Pharr-Reynosa International Bridge is among the top commercial crossings in the country — especially for produce — while the Anzalduas, Hidalgo-Reynosa, and McAllen-Hidalgo bridges carry heavy commercial and commuter flows. Developments near these corridors experience traffic patterns that a standard suburban study would miss.

Binational freight, cross-border retail traffic, and strong seasonal produce peaks all affect trip generation, time-of-day distribution, and truck percentages. Studies for logistics parks, cold-storage warehouses, and retail near the bridges require data collection and assumptions tuned to these binational patterns. We scope Valley studies with the bridge corridors and produce-season timing in mind.

Which agency reviews your study depends on the site's location and roadway access. Inside city limits, the City Engineering Department reviews the study — McAllen, Edinburg, Mission, Pharr, Weslaco, and Harlingen each run their own review as part of subdivision and plat approval. Hidalgo, Cameron, and Starr Counties review projects in their unincorporated areas.

The TxDOT Pharr District — which covers Hidalgo, Cameron, Starr, Willacy, and the surrounding Valley counties — reviews any access to a state-maintained roadway for a State Highway Access Permit. A single project near a jurisdictional boundary or a bridge corridor can trigger several of these reviews at once, which is why we identify every reviewer during scoping.

McAllen's Access Management Policy governs where and how a development can connect to the public roadway network — including driveway spacing, corner clearance, median openings, and shared-access requirements. On higher-volume arterials and near intersections, the policy limits how close a new driveway can be to existing access points, which directly affects site layout and circulation.

Getting the access strategy right early is often the difference between an approvable site plan and a costly redesign, particularly on the Valley's fast-growing commercial corridors. We evaluate access feasibility as part of the TIA so the driveway plan satisfies both the City's Access Management Policy and, where a state highway is involved, TxDOT's spacing standards.

Any new or modified access to a state-maintained roadway requires a TxDOT Pharr District State Highway Access Permit. The corridors that most commonly bring TxDOT into a project include US-83 and Interstate 2 (the Valley's main east-west route), US-281 and Interstate 69C, Interstate 69E, Expressway 83, and the frontage-road systems that parallel them.

For sites fronting these routes, TxDOT evaluates driveway spacing, sight distance, turn-lane warrants, and operational impact on the state facility — often alongside a concurrent City or county review. We prepare a single PE-sealed study scoped to satisfy both the local agency and the TxDOT Pharr District.

Timelines depend on the reviewing agency and the study's complexity. City Engineering Department reviews in the Valley typically run several weeks per cycle and are tied to the subdivision and plat approval schedule, so coordinating the traffic study with the platting timeline keeps the overall project on track.

TxDOT Pharr District reviews for State Highway Access Permits generally take longer where turn-lane design or signal warrant analysis is involved. When a project needs both local and TxDOT approval, we run the reviews concurrently so the overall schedule is governed by whichever review takes longest.