| DOT Operating Administration | RD&T Programs |
|---|---|
| DOT-wide | Crosscutting Environmental Issues* |
| FAA | Environment and Energy |
| FHWA | Pavement Research |
| Planning and Decision Making Research | |
| Planning, Environment, and Realty | |
| FRA | Railroad System Issues |
| FTA | Equipment and Infrastructure |
| OST | Transportation Planning, Research, and Development* |
| PHMSA | Pipeline Safety |
| RITA | Hydrogen R&D* |
*Crossmodal.