When I approach a bus stop which has a "slow down to 40 km/h" sign I literally remove my eyes from the road and place them on speedometer/smartphone. What coul

When I approach a bus stop which has a "slow down to 40 km/h" sign I literally remove my eyes from the road and place them on speedometer/smartphone. What could go wrong, you would ask... Distracting driver with signs surely has a cognitive and alertness cost.