The toughest part is to tackle human behaviour. On the Atal Setu, says Indrajit Gupta, I chose to drive at a consistent speed of 80 kmph in the middle lane. Vehicles on the right lane were clipping along at 150 kmph, way over the maximum permissible limit of 100 kmph. On occasion, I had to slow down or dodge vehicles suddenly pulling into the middle lane from the side.