Trafix

Trafix is an offline formula reference and calculator for traffic engineering.

Browse a clear, organized library of formulas covering traffic flow, capacity analysis, queuing and delay, signal timing, speed and density, geometric design, and highway design. Each formula comes with a short explanation and a list of its variables and units.

Many formulas include a built-in calculator: enter the values you know and get the result instantly, without doing the math by hand.

Trafix works fully offline. No account, no internet connection, and no personal data are needed to use the app.

A simple, fast companion for civil engineering students, traffic engineers, and anyone who needs a reliable reference for traffic engineering calculations