social media video shows the speedometer in a high powered car hit 149mph as the car’s occupants roar and shout.At one point, a road sign for Bathgate flashes past as a male voice shouts: “Lets f*cking have it.”An Instagram user posted the shocking video on Monday night with a series of laughing emojis.A source said: “It is unbelievable to see someone on Scottish roads driving at that speed."If that wasn’t horrific enough, they have been filming and driving at the same time.