Would there be customs checks when driving out of Texas?

There would be a border to cross, the way there is when you drive from the United States into Canada today, and the realistic picture is a smooth, fast crossing, not a wall. The exact posture is something the two countries negotiate, and every incentive points toward keeping it easy. People and goods drive across friendly international borders every day with minimal friction, and that is the model for the Texas-US line.

A border crossing is not the same as a barrier

The word "customs" makes people picture long stops and heavy inspection. Look at how a friendly border actually works. Driving from the United States into Canada means slowing at a port of entry, a brief check, and continuing on. The live answer on the post-independence border walks through this in detail using the long US-Canada line, where towns share libraries and kids cross daily for school. A crossing between an independent Texas and the United States would work the same way: a managed port of entry on a friendly border, not a checkpoint designed to stop traffic. The border exists; the friction is a choice, and neither side has a reason to choose a hard one.

The economics force the crossing to stay efficient

This is the strongest guarantee. The Texas-US relationship is one of the most economically integrated on earth, with goods and people moving constantly. Both governments have an overwhelming interest in keeping crossings fast, because a slow border taxes both economies. The same deep integration that opponents call a reason Texas "cannot" leave is in fact the reason the border stays efficient after it does: too much commerce depends on it for either side to gum it up. Keeping the lanes moving is in everyone's direct financial interest.

Trusted-traveler and streamlined-crossing programs already exist

If you want to see how easy a managed crossing can be, look at the programs already running on US borders. NEXUS on the northern border and SENTRI and Global Entry elsewhere give pre-screened travelers dedicated lanes and expedited crossing. The United States already runs the Border Crossing Card that lets people drive in from Mexico without a passport. These tools exist precisely to keep friendly, high-volume borders moving, and a Texas-US arrangement would draw on the same playbook. The technology and the procedures for a fast crossing are mature and in daily use.

What is honestly still to be negotiated

We will not pretend the exact posture is settled today. Whether crossings are near-frictionless, run under a streamlined trusted-traveler-style system, or sit inside a broader movement arrangement is part of what the two countries negotiate in the separation, and the terms are theirs to set. The freedom-of-movement question for people specifically is covered in the citizenship cluster, which notes that many Texans keep US citizenship and that proven models exist for open movement. The direction is clear: shared interest and real precedents push toward an easy crossing.

The bottom line

Yes, there is a border to cross, and no, it does not have to be a hassle. A friendly, high-volume border between an independent Texas and the United States would run on the same managed, expedited model the US already uses with its neighbors, kept efficient by the enormous mutual interest in moving goods and people. The exact terms are negotiated; the practical result is a smooth crossing.