Ratchet Straps vs Roof Racks: The Physics of Cargo Safety

A surfer-turned-DIYer asks: can a ratchet strap alone secure a two-meter shelving unit to a bare car roof? The answer involves tension physics, vibration creep, and the difference between clamping and wrapping. We break down why ratchet straps lose 30-50% of their initial tension on rough roads, how cam buckles avoid that failure mode, and what Israeli traffic regulations actually require — one meter rear overhang max, red flags, and specific load heights. Plus a comparison to UK and EU rules that reveal completely different regulatory philosophies on cargo safety.