Simply put, if there was a clear marking showing that the road ahead is blocked i am sure they would've stopped or slowed down. No one is that stupid. Islamabad police were saying cones were placed along with patrolling vehicle and signs etc, i mean who on earth would keep flying if that's there? Clearly they were lying and covering up their mistakes. Now, the bikers were on the wrong too, they were also clearly exceeding the speed limit on a public road but if the road block was placed properly this possibly could have been avoided.
I do feel sorry for them and their families, Allah unhe sabar ata kare.