What is the critical purpose of establishing a flagger 'escape route' prior to beginning flagging operations?

1. To provide an unobstructed path for the flagger to jump clear if an errant vehicle approaches.
2. To allow the flagger to walk to the crew break trailer for scheduled rest periods during the shift.
3. To provide a route for transporting spare sandbags to the merging taper.
4. To serve as an access lane for construction delivery dump trucks.