Hubby and I go twice a year to Yosemite and for at least the last five years there has been construction on the roads. First a new sewer and now repaving. It is very confusing for both new comers and old hands. This section which had two way traffic when we arrived was returned to its normal one way traffic. I watched as a confused tourist came up to the "lane closed" sign, turned back, pulled over for a while then tried to enter the one way lane only to be met by an irate worker. Many visitors come from other countries and have limited English. The Park Services does its best but I think every one will be glad when the construction is finished.
The Ahwahnee is a beautiful old hotel. The exterior parts that appear to be wood are actually concrete. The dining room is open to all but pricey. If you don't want to dine or book a room it is still well worth a stop to look around. It is on the shuttle route. Wikipedia has more information.
I have talked about the floods and rock falls, Yosemite has also had its share of fires. Across the meadow is the inholding community of Foresta. In 1990 a wildfire roared through the area forcing the firefighters to deploy their fire shelters in the meadow. One of our sons was working on a crew while in college and was in that meadow. Fortunately, I didn't know he was there until he was safe.