Wiktionary
on route
a. (misspelling of en route English)
Usage examples of "on route".
There's a lot of movement on the main roads, both along the coast to our west, and also east on Route 1.
But, remembering the bicycle, Owen yielded to his instincts and, after a brief search of the ground, he found recent tread marks of a heavy auto leading from the barn, down the driveway and then west on Route 236.
Still, after passing two intersections-and verifying that the madman was continuing west on Route 236-Heck ordered Emil back to the truck.
Leia announces that a warfleet has been detected on route to Endor - the Nagai.
The traffic problems on Route 50 west were immediately apparent, and he changed lanes to head east.