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We investigate the longevity of broad bridge features in position-velocitydiagrams that appear as a result of cloud-cloud collisions. Broad bridges willhave a finite lifetime due to the action of feedback, conversion of gas intostars and the timescale of the collision. We make a series of analyticarguments with which to estimate these lifetimes. Our simple analytic argumentssuggest that for collisions between clouds larger than R~10 pc the lifetime ofthe broad bridge is more likely to be determined by the lifetime of thecollision rather than the radiative or wind feedback disruption timescale.However for smaller clouds feedback becomes much more effective. This isbecause the radiative feedback timescale scales with the ionising flux Nly asR^{7/4}Nly^{-1/4} so a reduction in cloud size requires a relatively largedecrease in ionising photons to maintain a given timescale. We find that ouranalytic arguments are consistent with new synthetic observations of numericalsimulations of cloud-cloud collisions (including star formation and radiativefeedback). We also argue that if the number of observable broad bridges remains~ constant, then the disruption timescale must be roughly equivalent to thecollision rate. If this is the case our analytic arguments also providecollision rate estimates, which we find are readily consistent with previoustheoretical models at the scales they consider (clouds larger than about 10 pc)but are much higher for smaller clouds.

Isolating signatures of major cloud-cloud collisions II: The lifetimes of broad bridge features