Dear contest holder I suggest you to make your logo in wordmark. Because it increases the familiarity of your company. For example, if I say my name is Abdul Hadi standing before you, I don't need to show you my picture. Similarly, you provide the service to the customer on the spot from the texi,so, you don't need to show a Van or texi on logo. You have texi or van, now you need its name, nothing more. You can see, every one copying others idea