Three things to knowDowntown traffic will feel the start of Sambadrome logistics, with float-movement operations beginning today. CasaBloco opens tonight at the Jockey Club, turning Carnival culture into a controlled, ticketed venue circuit. The city updated taxi rules for Carnival, including wider use of bandeira 2 and fixed-price executive options. The city sees supply chains. The Operations Center said a traffic scheme begins today for the movement of samba school floats.