You should never cut into the open space between a truck and the curb if the driver has signaled to turn because

Large trucks cannot turn without first swinging wide in the opposite direction.

Explanation: if you overtake or cut into open space between the truck and the curb it is likely that you will crash or hit your car into the long tail of the truck and you may lose your life so waiting is worth saving your life.

answer; unimodal and symmetrical;

answer; mechanics;