With the 2016 IndyCar season upon us, the memory of Justin Wilson's passing brings us back to the topic of driver safety. Tethers are going to be in place for various parts/pieces of the cars.
On the topic of canopies or halos, F1 did some testing with halos earlier this year. Here are pics of the Ferraris with prototype devices for driver protection.
Bear in mind these are first concept devices.