dozy:
Tesco give you risk assessments with the route you must follow , don’t start taking any notice of some random driver off heres route or start thinking for yourself , or Tesco won’t be employing you for long
What do you do then? Just sit and wait at the cones for six hours until they lift them? 
Edit: From my personal experience I’ve never had any questions about which way I’ve gone whether that be because of closures or just because I fancy a change of scenery from time to time.