Self-driving trucks and zero-emission trucks are two of the biggest changes coming to freight, and they are often talked about together. They are separate technologies, developing at different speeds, that sometimes reinforce each other and sometimes pull in different directions. This page explains where they overlap today and what fleets should watch.
| Autonomous vehicles (AVs) | Zero-emission vehicles (ZEVs) | |
|---|---|---|
| The question it answers | Who, or what, drives the vehicle? | What powers the vehicle? |
| Main benefits claimed | Driver shortage relief, longer daily operating hours, safety | No tailpipe emissions, lower energy and maintenance costs on the right routes |
| Main constraints | Safety validation, regulation, public acceptance, weather | Range, charging or fueling infrastructure, purchase price, weight |
| Who regulates | NHTSA (vehicle safety), FMCSA (truck operations), and states | EPA and states (emissions), plus energy and utility regulators |
Industry groups use the SAE automation levels. Most driverless freight operations today are Level 4: no human driver is needed, but only on approved routes and in certain conditions.
Company milestones come from company announcements. This is not an endorsement, and the field changes quickly.
There is no comprehensive federal law written specifically for autonomous trucks. Federal safety standards and trucking rules still apply, and federal agencies have issued guidance and handled exemption requests. States set many of the rules. Texas, Arizona, and several other Sun Belt states allow driverless trucks, and California approved regulations in 2026 that allow testing of heavy-duty autonomous trucks on public roads for the first time. Check your state’s department of motor vehicles or transportation for current requirements.
Emissions rules apply to autonomous trucks the same way they apply to any truck. For the current status of zero-emission truck rules, see the 2026 Regulation Tracker.