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Message: <blockquote data-quote="jmatt20" data-source="post: 54441" data-attributes="member: 186"><p>well i'm going to assume the dot didn't use anecdotal evidence to determine weather or not to approve any particular tie down system..in a crash situation i don't know what is going to cause my machine to accelerate , everything is going to slow down, maybe at different rates. You are correct that inertia is going to have an effect on the loading of the tie down system. The straps do stretch but they do not stay stretched they are elastic and stay taught as you go over bump and dips..In an accident they can provide dynamic holding ..a little give rather than try to hold a load statically. In most loading applications a dynamically applied braking system is superior to a static loading of the system In your overpass accident how did the excavator move ??? with the static chain system for the excavator to move either a chain had to break or a d ring had to fail there should not have been enough slack in a chain for the machine to move all the way to his tailgate you are also correct that straps can fail ..so can chains, there are some accidents that you just aren't going to walk away from unscathed. Both systems are approved and who can tell how the forces are going to be applied to them in any given accident in some cases one might be superior to the other ....if only we could plan our accidents !!</p></blockquote><p></p>