detour

Short definition from Wiktionary

Noun

1. 1
   A diversion or deviation from one's original route.
2. 2
   An temporary alternative route available to motorists away from the usual route due to a closure for repairs, dealing with an accident, or some event rendering the usual route unusable.

Verb

1. 1
   To make a detour.
2. 2
   To direct or send on a detour.