Back in the day when I actually got to travel – it doesn’t happen much for me anymore. We’d charge a 1/2 day rate for the travel day and our day rate plus any overtime for the shoot days. I, personally, don’t think it’s right to charge your client for the work you can’t do while you are on the road. When I’ve had situations like that I pack up the laptop and hard drives and am working while my client is at the bar.