When placing bets at a busy roulette table, proper etiquette revolves around being respectful and considerate of other players and the dealer. It's important to wait for the appropriate moments to place your bets, typically after the dealer announces that betting is open. Avoid reaching across the table or disrupting others as you place your wagers. Use clear gestures to communicate your intentions, and if you're new or unsure, feel free to ask the dealer for assistance without being disruptive.