We don't have synonyms for red route yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are re route, red rot and en route.
(n) :
(chiefly British) A system of traffic management, marked by red lines along the edge of the road, where parking, loading or picking up passengers is restricted.
(n) :
(UK) A route that has a higher-than-average rate of traffic accidents.
(n) :
(chiefly British) A system of traffic management, marked by red lines along the edge of the road, where parking, loading or picking up passengers is restricted.
(n) :
(UK) A route that has a higher-than-average rate of traffic accidents.