A motorist who observes an ambiguous situation at a pedestrian crossing (such as a person looking back over their shoulder) and responds by taking their foot off the accelerator and scanning the crossing acts reasonably; requiring emergency braking in such circumstances is hindsight reasoning. Even where a motorist breaches the duty to keep a proper lookout to the front, the breach is not causative if the evidence establishes that at the speed of travel there was insufficient time to react and brake once the hazard became visible.
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