running room

noun

the space between a racer and the nearby competitors in a running race, especially enough to run and maneuver as desired.
the space or leeway permitting ample freedom and flexibility to operate, maneuver, or perform without impairment.

Origin of running room

probably earlier than 1980–85

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018