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One -- This is the way to Santiago.
Two -- There is a radio transponder toll booth ahead. If you don't have one of the little radio devices glued to your windshield, you shouldn't take this exit.
Three -- There's an overpass ahead. Yes, the darned things are rare enough that they have picture signs telling you they are there.
The scarcity of overpasses makes for interesting driving. You have to drive 10 miles past where you want to go on the freeway to get to an overpass where you can flip around and get on the right side of the road for your non-overpass exit. Of course, your exit may lead to another freeway where you'll have to do the same thing.
Likewise, on surface streets, you have to drive miles out of your way to find a place where you can cross over the freeway.
Once you get to the neighborhood you want to be in, you're faced with another problem. Problems. One problem is that there are a lot of one-way streets. You end up circling your destination to get there. Another problem is that several of the main roads switch the lane directions depending on the time of day. It's a great way to mitigate rush hour traffic jams, but it makes it more interesting if you're headed in the counter-commute direction.