Not really a landscaping question, but, I'm working on some designs for a new staging yard and I need to map out a driveway that will allow access for delivery trucks. Most of my materials arrive smaller trucks or dump trucks. I get regular shipments of mulch via roll-off containers in 30 yard loads, however, I have the option of getting 55 yard deliveries via a "semi" live load trailer. I want to make sure my driveway, parking area is large enough and designed properly to accomodate these trucks. What are some guidelines that I should follow??