Stop building, widening and duplicating motorways, and start building high capacity public transport infrastructure instead.
#BrisbaneSubway is an old proposal from 2011 but was shelved. In light of the Darra to Toowong car tunnel idea it should be revived.
Other improvements like BRT for the Centenary suburbs, the Springfield to Ipswich line via Ripley and Yamanto, and frequency, speed and reliability improvements to existing lines and routes.