I have had decades experience in F&C here in the USA and Canada, AND have worked as a skilled tradesman in TMP, that's... traffic maintance & protection on road construction jobs on NY STATE highways in western NewYork.
( being less than a meter from an F-1 car at high speed,is MUCH, MUCH safer than being on the shoulder of a public highway....believe me...)
( being less than a meter from an F-1 car at high speed,is MUCH, MUCH safer than being on the shoulder of a public highway....believe me...)