As opposed to a lorry driver, that is! As I understand it, car drivers heading towards the Eurotunnel at Folkestone have to exit the M20 at j8 (?) and use the A20 due to the lorries parked up on the M20.
Is this correct? Do you use the A20 for a while and then get back on the M20 further along? Or A20 all the way to Folkestone?
We are travelling next week and I am getting anxious about how much time we will have to allow in order to make our Eurotunnel slot. It might be me, but I don't think the information given on their website is very clear! 
Thanks for any info!