...As a side benefit, its presence on the hood should help remind drivers that they're carrying a load on top, so they don't smash that load into things like garage doors or other overhead obstacles

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The Leveret Roofscope is a supplementary bonnet mirror that acts as a reminder that you've got stuff on the roof of the car. It's easy to fit and it does what it says on the tin

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If you regularly transport bikes on the roof of your car, and you’re a bit paranoid about them being up there even though you’ve triple checked every strap, then the RoofScope could be for you

 

Roof mount bike rack paranoia be gone!

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And here

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High-speed driving had no ill-effects on the unit and it remained stable throughout our testing on rough roads as well

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Ever had that cold fear when driving down the motorway, bikes on the roof, and something starts making a knocking sound? ... Luckily, the RoofScope provides peace of mind

 

 

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Easily mounted on the hood of your car, the convex mirror allows you to easily check to see if your bike (or anything else) is still securely mounted. Another advantage, is it serves as a quick reminder that you have items loaded up, which should help reduce the number of accidental garage to bike collisions

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Position the mirror to see what is going on up top

... it does act as a visual reminder