Warning signs
Warning signs are TRIANGULAR with a red border. They warn of something ahead so you can slow down and prepare - they do not, by themselves, forbid anything.
Common ones on Nepali roads: a bend, a steep descent or climb, a narrow bridge, falling rocks, a slippery road, road works, a level crossing, children or a school, animals, and a junction ahead.
The correct response is always the same: reduce speed, cover the brake and look for the thing the sign is warning about.