Blowing a stop sign is the same as running a stop sign; or a red traffic light.
A thing that a guy did yesterday, if I was a guy in a hurry I would have hit his car door... he, and I - we are lucky that I am a careful driver.
And still luckier that there was no car dangerously closer behind mine.
As you already know already, the imagery is that the guy from your question is "avançadinho". Imagery of "avançar sinal".