Indicators?

It almost makes me want to take back everything I ever said about drivers in Evanston - the driving in Houston really is appalling. I made a quick survey on my way to work on Friday morning, and 25-30% of drivers turning left did not indicate. There are many places where the driving is known to be difficult - if you've ever driven in Italy, you'll know that drivers are aggressive, and if you want to get anywhere, you have to be aggressive too. But in Houston it's different. I don't think the drivers are doing this out of spite, or a need to get anywhere quickly, or because they want to show off how man they are. I think they actually are just plain dumb. Maybe of them don't realise you're meant to indicate when you change lanes on the highway, or stop at a stopsign, or give way if you're turning left. I'd be interested to see what the driver's education here is like, and then I'd like to challenge someone to try and fail the Texas driving test. Having seen the drivers that have passed, it cannot be a triviality.