Hi Joan,
You just would not use the inversion in this case for several reasons.
Firstly, it would be the wrong register for a taxi driver (or anyone of us) to use as the inversion always sounds more precious than using est-ce que for instance in everyday situations.
Also, it is very rare to use the first person inversion in a question as it sounds clumsy -
Dors-je? prends-je, sais-je, etc.
You will hear/read -
Puis-je, dois-je, suis-je
but in my opinion, they are to be used sparingly and it is best to concentrate on using 'est-ce que + statement' which is the most used formula for asking questions in France.
Hope this helps
