Road comrade
When you are on the bus and get stopped at a red light, and another bus pulls up in the lane next to you. The driver is a road comrade, and your driver will salute them in respect, and if you are lucky, will start speaking fluent Russian. Witnessing the interaction between a bus driver and a road comrade is said to bring about joyous and happy times to come.
As the bus stopped at the pedestrian crossing, my bus driver saluted a pulled up road comrade with a few Russian phrases before continuing on his way.