Grand Theft Auto IV 999% Driving Speed

I completed FOUR missions in GTA 4 with traffic going 9999 km/h (1x17)

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NO-ONE bothers my boy Bernie! He deserves to run in the park all he wants! My boy Bernie needs to keep his cardio up and get used to his fun new run cycle, and if anyone hassles him they'll have to answer to me. Listen pal - every mission in this game is driving somewhere and shooting something, and I'm all out of driving somewhere. Also I'm scared of driving because all the cars go fast. We take out four missions, click some heads and get pasted by several cars and trucks, turnabout is fair play.