[Jody Barton]

The general shape, and area for coverage are set by the rules, as is the strength testing and the amount of load the structure should be able to take... However... nothing I saw on the rules stipulated it couldn't be used as an aerodynamic device. So do I expect turning veins and winglets, or leading and trailing edges to be sculpted like wings? Answer, yes. Didn't McLaren test a small wing on top of the halo at one race? I'm sure they did.

The really big issue though is one of weight. I think some teams are saying it's adding as much as, or in excess of 10kg to the cars. The FIA said 6Kgs max. Well... I believe the 6 teams whining about the weight, so when the likes of Merc rock up with a 4Kg Halo that passes the load tests that'll be the real advantage. The team that makes theirs the lightest. But if the leading teams have as much as a 6Kg advantage over the others, that's a hell of a lot of lap time.