Gauging Your Distraction
nytimes.com
nytimes.com
(my results: http://img339.imageshack.us/img339/787/picture1krx.png)
I played once and got the same deltas as you (0.02 and 0%) but times consistently somewhat worse than yours. The approach I used was to ignore the phone except for the interval between reacting to each gate's sign and passing through it.
(Why anyone in their right mind would be texting while driving, I don't know.)
In Safari and FF, I complete the texts, the gates stop, and it sits on an empty road.