Family left at 6AM this morning to San Antonio. As of 10AM, they are just past Sealy - about 45 miles. They described it as an 'end of days scene' people out and walking around their cars, etc. I'd imagine that about 2 million people have to have left.... and thats still less than half the city. I guess you just cant evacuate a city that big in under three days.
For Houston live traffic cameras see:
http://traffic.houstontranstar.org/cameras/camtext.aspx