Tried to at least take some road-related pics when I was there. No countries used reassurance markers on any of the highways, but numbers were posted on junction signs in both Kenya and Tanzania.
(https://i.postimg.cc/zX2xpTYy/1000017229.jpg)
(https://i.postimg.cc/8CMw13Jv/1000017231.jpg)
(https://i.postimg.cc/tJCzN4rd/1000017246.jpg)
(https://i.postimg.cc/RFTRtHTV/1000017248.jpg)
(https://i.postimg.cc/zvtFtYMs/1000017955.jpg)
(https://i.postimg.cc/ZYVHK6Rw/1000018016.jpg)
(https://i.postimg.cc/HsNtbHb5/1000018057.jpg)
(https://i.postimg.cc/3xDFB6Zq/1000018231.jpg)
Interesting how similar the signage in Tanzania is to Namibia, South Africa, and Lesotho.
Another fun thing I learned is that, in Tanzania, if you have a yellow license plate, you can basically drive as fast as you want. It's a private car. If you have a white license plate, the speed limit is 80kph since it's a commercial vehicle.