I have about 2000-3000 feet of various pipes in the ground. I have never had a problem with the corrgated drain pipe crushing unless I crush it during install. I bury it about 18 inches deep minimum. As a matter of fact someone is in the backyard trenching right now and asomeone else is at the store picking up 250 feet of unperforated corregated. I'll put T's at 1/3 and 2/3 distance and drill holes at the low spots in the pipe bottom only, and lay rock below at the low areas.http://www.w8ji.com/contest_station_w8ji.htm
I drive tractors and my F250HD diesel across pipes all the time, and two cross my stone driveway.
What you cannot do is tamp the soil with something or step on the pipe until it has at least six inches of packed dirt. For example I have crushed it by getting my tractor front tire in a fresh trench because I lined the wheel up with the trench before it had much dirt in it. Once there is a foot of dirt I can cross it any angle.
I have some thinner wall plastic drain pipe like for septic systems, too. It is easier to pull long cables through, and a little tougher. Maybe 5 or 8 of them between 50 and 300 feet long.
I advise, no matter what type of pipe, having drainage at the low spots. If the spot is always wet then a sealed pipe with forced air venting might be necessary, or use hardline and flooded direct burial cables and just let the water pile up.