The risk increases. Yes. the amount it increases depends on how much care is taken when changing lane. How many "drivers" are already changing lane when their indicator flashes for the first time.Whenever a lane change happens the risk of collision increases.
Mirror, indicate, count four flashes, check lane is still clear, change lane was what I was taught.
Would you like cars restricted to the maximum safe speed of heavy goods vehicles to ensure no speed differential.It's a fact. No speed differential - no need to change lane.
