IndyCar: Video that explains the ''Push-to-pass'' button

Here's a short video produced by the IZOD IndyCar series that explains how the infamous "Push-to-pass" system works on the DW12 Dallara Indy car.

Professor B, who is former Indy Lights and IndyCar driver Jon Beekhuis explains how the system works on the V-6 turbocharged enginem and how it can facilitate the passing manoeuvres.