Marcus Richardson struck a stoppage time equaliser to earn Reds a vital point over their relegation rivals.
Robbie Simpson surged through to put the visitors ahead in a drab first-half and Jimmy Quinn's side looked to be heading for an important victory.
However, well into injury time, substitute Richardson rose highest to head past goalkeeper Paul Crichton for his first Crawley goal and break Cambridge resistance.
Robbie Simpson surged through to put the visitors ahead in a drab first-half and Jimmy Quinn's side looked to be heading for an important victory.
However, well into injury time, substitute Richardson rose highest to head past goalkeeper Paul Crichton for his first Crawley goal and break Cambridge resistance.
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