Crossword Genius

On the roads does it cut in, half the time? (4)

Ross

I believe the answer is:

taxi

I'm a little stuck... Click here to teach me more about this clue!

But I can't explain it at all! Could you help me understand?

(Other definitions for taxi that I've seen before include "Transport for hire" , "I hail you!" , "Vehicle that plies for hire" , "Hackney carriage" , "Rank occupant" .)

Want a hint initially instead of a full solution? Install my app