Hi taxi4u,
you are using Taxi Booking for Special routes only.
When you create Special route there is an option Separate prices for each car: which you have set to Yes.
In this case each Car will have it's own price that you can set up in the car table on the same screen.
Cars with price set to 0 will not show at the front end for this Special route (flat rate fare between 2 destinations).
You can either set "Separate prices for each car: No" to use the same price for all of your cars or
Set separate price for each Car in the cars table.
For more information on Special routes (fixed rates) please see this article:
http://kanev.com/blog/21-how-to-use-taxi-booking-for-fixed-prices-between-destinations
Hope this helps.
Best regards.