Preface: This is not meant as a political statement but a simple engineering question. If you could magically snap your fingers and instantly get all of the vehicles currently being driven in the Houston area by "undocumented workers" off the roads how much would traffic improve? These people are not supposed to be here to begin with and it's like they are helping to clog up the roads. I believe this is a valid question. This group of motorists seems to be a large contributor to bad traffic. I ask this based on my observations on a daily basis of the vast majority, if not all, slow downs, stalled cars, towed cars, 20 guys in the back of a weighed down truck struggling to get up an overpass, broken down wrecks on the shoulder causing rubber necking, and people driving 20 miles an hour for fear of getting pulled over being driven by what is a very safe guess to be illegal aliens. I think its intellectually dishonest to deny that this is an issue. But how can it be dealt with? It won't and it will only get greater as our population is regularly said to be growing by what two million people in the next twenty years? You can't seriously believe most of those people aren't going to be illegal immigrants. I am not a racist trying to stir things up. Please don't make this a political issue I'm not going to respond I am simply interested in the science of traffic and was wondering how things work. I never hear anything about this topic because it's probably not PC.