If we're staying in our neighborhood of Tuol Tompoung (TTP/the Russian Market), we can easily get around on foot. There are very few sidewalks and, where they do exist, they're used as street parking for the motorcycles and tuk tuks that fill the streets. So we're often walking single file on the side of the road. Most intersections in town have no stop lights or stop signs - it's all a "yield in all directions" situation, but yielding is far too strong a word. Mostly, the larger vehicle you're in, the more right of way you have. And if a large vehicle dains to stop for us to cross the road, we're sure to run into motos zooming around them which we then have to navigate. We're getting there...
When traveling to another neighborhood within Phnom Penh, we take a tuk tuk! Day 2 of our stay was our first tuk tuk experience. We can order a tuk tuk from the Grab App, just like one would order an Uber or a Lyft back in the United States. A tiny one would be too small for all 3 of us, we think, but we can order it "maxima" and there's just enough room for Familia de Warren to squeeze in.
A tuk tuk across town, even at maxima sized, costs us about $2-$2.50 which we can pay by credit card directly in the app. We recommend a Charles Schwab debit card for anyone traveling internationally - it has great (read: low/no) fees and exchange rates and doesn't freak out when it receives unexpected pings from abroad.
A remorque is a little larger than a Tuk Tuk. It is a motorcycle towing a wagon, basically. Four to six Americans could comfortably ride in these, which means it felt down right luxurious to Familia de Warren. The added benefit, for us at least, is that it is a bit more open air than the Tuk Tuks are, so tall daddy can see out while we're riding around town a bit more. After a long, hot morning at Wat Phnom and the Central Market, we enjoyed the breeze and views on our way home.
If we're going a longer distance, want more seats, or are concerned about bumpy roads, we can call a car in the Grab App just like we call a tuk tuk or remoreque. One might think a car would be faster, but it does depend on the road conditions and traffic conditions whether a car is actually beneficially at all.