vehicular

adjective2

1. •
   Of or pertaining to a vehicle or vehicles, usually specifically cars and trucks; involving a vehicle.

   • Ernest had a fear of vehicular travel, and ended up walking everywhere.
2. •
   That is used between two groups who do not share a common native tongue nor a common culture.

   • English is used as a vehicular language in many business settings.
   • Latin was a vehicular language for natural philosophers and others from the late Renaissance to the late 18th century.