Every 90 degree transfer in a system is a potential collision point. The calculation tells you the minimum gap required. If the gap on the trunk line doesn't meet that minimum, you've got a carton collision on every transfer cycle. I've seen this missed in proposals more than once. Run this calculation for every transfer in the system, and on the critical ones don't stop at the four-inch safety margin, add eight to ten inches for product presentation and belt slippage.
