I did a Bangkok trip last week and both ways I arrived at destination tired and worn out, and it has nothing to do with age. Here, all of your senses and driving skills have to work overtime trying to anticipate every possible absurd thing that possibly could happen. The motorway and elevated Bangkok-Chonburi highway is not bad, but even on those without fail you'll come cross drivers in the right or middle lanes doing 60kph and if there is a stream of fast traffic in the other lanes, you'll need to slow and sometime even brake before your chance to pull out and go around him.
On that elevated highway the speed signs were flashing 80kph maximum speed as they always do. However, there was an electronic digital sign spanning the overhead across the lanes at one point that in Thai said "....don't go faster then 90kph in order to save fuel..." WTF


In Bangkok we sat several times for 2 or 3 cycles without the light turning green as it was being controlled by an MIB in an air conditioned booth who thought it was better to let the main artery flow longer.

Enough from me. Let's hear experiences from some others. Pete
