I think it was in 1983, I was travelling to Molo, in the highlands on the western side of the rift valley. About 5 miles after I had turned off the main Nakuru to Eldoret toad towards Njoro we had to stop because there was a 10 foot wide chasm running right across the road. I went to the edge of the rift and looked down, but could see no bottom. I then dropped a largish stone into the rift and listened to it bouncing off the edges as the sound gradually faded away with no indication of the depth.
The rift extended on both sides as far as the eye could see. (It was later confirmed to be some 20 miles long.) We went back to the main road and detoured to an alternative road, about 40 miles to the North.
This incident carries a humourous anecdote. Two large barriers of earth were built across road, just short of the chasm. A sensible precaution.
However, the people who had been ordered to build them, put them both on the same side of the chasm. Ah well....!

(Is it too early to buy property for an ocean-side resort?)