@JohnFromGWN Thanks for the link. I did download that tool a few days ago, but my rig doesn't have Accel on it and I can't see purchasing it for a $100 a year just to modify the files. I did download the trial version of Accel, but you only can use it for a few weeks before Microsoft wants to bill you. Having never used it before, the learning curve and time limit are a bit tight.
I'm not opposed to manually editing the files, that's what I did before, I've just forgotten what I need to do to get the traffic how I want it. All the tutorials I've found are geared to adding new dlc vehicles to traffic rather than editing the vanilla ones to respond differently.