If this goes to law it, it could be abused. At least if they suspect DUI there is a breathalyzer. This would be just someone's interpretation of what street racing would be at the time.
Even if that person had all but the best intentions, there can be mistakes. I like to accelerate fast away from a light from time to time, okay most times, but I'm not street racing.
This is a really bad idea, and more of the pussification of the country. The "I'd rather feel safe, than be free", attitude will ruin us all.