What Car? Q&A - Introduction

Whatcar.com's experts have been busy answering some keen questions from our readers.

In our postbag this week… Biodiesel, switching off an airbag, and night driving in France.

Click here to submit a question to the Q&A team. We publish a selection of your questions – along with What Car?'s answers – here every week.

You can also turn to the What Car? Helpline with motoring problems or disputes you might be having. Click here to e-mail the Helpline.