What is vehicular language?

There's no official term or concept known as "vehicular language". It's possible you're thinking of a similar concept or a different term altogether.

To help me understand what you mean, could you provide some context? For instance:

* Where did you encounter this term? Was it in a book, article, website, or conversation?

* What was the context? What were they talking about when they used the term "vehicular language"?

* Are you thinking of a specific kind of language? Perhaps a language used in a specific context like transportation or a vehicle-related industry?

Once I have more information, I can better understand what you're looking for and provide a relevant answer.