What prevents activated platelets from sticking to intact blood vessels near, but not at, the site of injury? Release of

Question

What prevents activated platelets from sticking to intact blood vessels near, but not at, the site of injury? 
Release of thromboxane A2 by the endothelial cells. 
Release of histamine at the site of injury which sequesters platelets at the injured location.
Inhibition of the release of prostacyclin from sub-endothelial cells. 
Lack of exposed collagen to which von Willebrand factor has bound.

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