last car was fastest. third was faster than 2nd, 2nd may have tried to stop in time but was in vain.
rule is keep number of cars distance according to yr speed to avoid going to denter/painter.
10 mph.. you should not less than 1 car away from front car. 40 mph keep at least 4 cars distance.
But here in Pk due to slippery roads,, increase the distance bit more.