I see this a good bit. I’ve seen younger holding on, but I got a pic of this little guy. Typically traffic is moving pretty slowly, 15-20 mph. They know to hold on!

Not a good picture, but this is how they do weddings in Cambodia. We have seen dozens, maybe 100+ wedding setups. They will setup on the side of main roads, alleys, side roads. Really wherever they can fit. They sometimes stay up for a few days, but this one was only 1 day. This is the road we live on, so we had to take a slight detour to get around it.
They set up large tents, and decorate all the tables inside. This wedding took place at night, so it was 20 degrees cooler than the typical 100 degrees F we have in April.

