These yellow flashing signs are useless, as you say, but you'd think that drivers are conditioned to obey traffic lights, and most every tunnel in existence - i

These yellow flashing signs are useless, as you say, but you'd think that drivers are conditioned to obey traffic lights, and most every tunnel in existence - including the one in Sydney - has these red and green lights up top that allows the tunnel crew to block lanes individually. I couldn't tell why truckers see these and still blow through them.