saobraćaj

1. traffic
   Zaglavili smo se u saobraćaju na mostu. — We got stuck in traffic on the bridge.
   Saobraćaj je jutros bio užasan. — The traffic was terrible this morning.
2. transport; transportation
   Javni saobraćaj u Beogradu je besplatan. — Public transport in Belgrade is free.
   Železnički saobraćaj je obustavljen zbog snega. — Rail service was suspended because of the snow.

"Public transport" is javni (gradski) saobraćaj or javni prevoz.