Do I Need a Traffic Impact Analysis in Texas?

You've found a piece of land. Maybe it's 8 acres in Schertz for a small subdivision. Maybe it's a pad site in Katy for a drive-thru. You're working through your due diligence, talking to the city, and someone — the planner, your civil engineer, a buddy who's done this before — drops the phrase “traffic impact analysis.”

Suddenly you're staring at a study you didn't budget for, a timeline that could push your entitlement back six weeks, and a rezoning conversation that just got a lot less predictable.

That uncertainty is the real problem. Most developers we talk to aren't afraid of doing a TIA. They're afraid of getting hit with a bigger bill, a longer schedule, and more engineering than the project actually needs.

Here's the honest version: a Traffic Impact Analysis isn't always required, and the ones that are required are often smaller and cheaper than developers expect — if they're scoped right. What follows is a practical breakdown of when you need one, when you don't, and how to avoid the over-scoped study that costs you weeks and dollars you didn't need to spend.

What a TIA actually is (in plain English)

A Traffic Impact Analysis is a study that estimates how many additional vehicle trips your project will add to the surrounding road network and whether the existing roads can handle it. Cities and counties require it before approving site plans, plats, and zoning changes. The deliverable is a report — usually 30 to 80 pages — that gets submitted with your entitlement package.

That's the technical description. What it actually means for you is three things:

• Unexpected city requirements that show up in the middle of your entitlement process
• Project delays, often four to eight weeks, while the study gets scoped, run, and reviewed
• Uncertainty during rezoning and planning, because you don't know what the city will ask for until you're already in the process

Those are the costs of getting surprised. Avoiding them mostly comes down to knowing whether you're going to trigger a TIA before you commit to a price and a timeline.

The three triggers that almost always require a TIA in Texas

Before we get into the patterns, an important caveat: every Texas city handles TIAs differently. What triggers a full TIA in Schertz may only require a traffic memo in Seguin. Smaller Texas municipalities often don't have standardized requirements at all — it's a conversation with the planning department, not a checklist on a website. With that in mind, here are the patterns that hold across most jurisdictions:

1. 1Trip generation thresholds. Most Texas cities use 100 or 200 peak-hour trips as the cutoff. If your project will generate more than that during the morning or evening peak hour, expect a TIA requirement.
2. 2Specific land use types. Certain uses trigger a TIA regardless of trip count: apartments above a certain unit count, retail above a certain square footage, drive-thrus, gas stations, schools, and self-storage facilities with frontage on an arterial. If your project falls into one of those categories, assume a study is coming.
3. 3Driveway access onto a major road. New access points onto arterials — and especially onto TxDOT-controlled corridors — almost always require a traffic analysis as part of the permit application, even when the project itself is small.

If you're looking at this list and seeing your project in two or three of these categories, you're almost certainly looking at a TIA. If you're seeing it in none of them, you may be looking at something much smaller — which brings us to the next point.

Most small developments don't need a full-blown regional study

This is the part most developers don't hear early enough. Many smaller projects in Texas only require one of three things:

• A traffic memo — typically 5 to 15 pages, focused on a single question
• A limited trip generation analysis — showing the city your numbers without a full operational study
• A focused review of one or two intersections — not the whole network

The biggest mistake we see is developers hiring a large firm that automatically scopes the project like a major commercial development. That's how a $4,000 memo turns into a $25,000 study and a four-week project turns into four months. A properly scoped analysis can save both time and money — sometimes weeks of review and tens of thousands of dollars in engineering fees.

City-by-city quick reference (with the caveat that codes change)

A few examples of how Texas cities actually handle this, as of the most recent code updates:

• Schertz: TIA required for developments generating 100 or more peak-hour trips
• Seguin, Boerne, Katy, and similar growing municipalities: requirements vary significantly — some have published thresholds, others handle it case-by-case through the planning department
• TxDOT projects: separate access management standards apply on top of city requirements, regardless of project size

Two things to do before you assume anything: read the local Unified Development Code (or whatever the equivalent is in your jurisdiction), and call the planning department. A ten-minute phone call with the right city planner will tell you more than three hours reading code.

The “scoping meeting” — the most underused tool in entitlement

Before you commission a full TIA, you (or your engineer) should sit down with the city and agree on exactly what the study needs to cover. This is called a scoping meeting, and it's the single highest-leverage thing you can do to control your TIA cost.

A good scoping meeting can cut the scope of the study in half — fewer intersections analyzed, fewer scenarios modeled, fewer revisions later. Large firms often skip this step and just scope the study based on their internal templates. Right-sized firms make it the first call.

Red flags that mean you definitely need a TIA

If any of the following are true on your project, stop guessing and assume you're doing a study:

• City planning staff have used the words “traffic study” or “traffic memorandum” in any conversation
• Your project includes a new driveway onto a road that's already congested
• You're rezoning to a higher-intensity use — e.g., agricultural to commercial, single-family to multifamily
• Adjacent neighbors have started showing up to council meetings

What happens if you skip it

Developers occasionally ask whether they can just file the entitlement and see what happens. The answer is yes, but the outcomes aren't good:

• Plat or zoning denial — the most common outcome, and the cleanest to recover from
• Conditional approval that requires the TIA before plan recordation — same delay as doing it upfront, except now you're under the gun and the city sets the timeline
• Worst case, post-construction enforcement: the city refuses to issue your certificate of occupancy until you complete off-site improvements identified retroactively

None of these are better than just running the study at the right time. The cost of doing a TIA late is always higher than doing it early.

Why smaller developers work with Atlas

We focus specifically on smaller and mid-sized projects in growing Texas communities. Our goal is to help clients understand what's actually required — and avoid unnecessary scope, delays, and engineering costs.

Because we regularly work with municipalities reviewing development traffic impacts, we understand how to navigate the process efficiently and communicate with agencies early. That's often the difference between a four-week review and a four-month one.

Not sure where your project lands?

If you're not sure whether your project needs a TIA, a traffic memo, or nothing at all, send us the site location and a quick description of what you're building. We'll review it and point you in the right direction within 48 hours — no charge, no commitment.

• Email: rguerra@atlasengineers.org
• Phone: (210) 416-1354