भारत में एक सचेतक या चेतावनी यातायात संकेत किस ज्यामितीय आकार में प्रदर्शित किया जाता है?

When a vehicle approaches an unmanned or unprotected railway level crossing, what should the driver do before crossing the track?

When approaching a roundabout (traffic rotary) to enter it, what is the standard right-of-way rule in India?