Critical means that there are now crowded with traffic or obstructions, or in that which is seen or know in advance that there will be danger or damage to vehicle or people easily.
That means the emergence of traffic congestion. Or obstruction Or in a discernible Or know in advance that it would be dangerous. Or damage to vehicles or people easily.
The critical means, with the traffic is busy, or obstruction, or in which to see or know in advance whether it was dangerous. Or damage to vehicles or people easily.