The reason for that is simple: this road is not open to the general public most of the year. The army only opens it on some of the Jewish holidays.
Road 10 is 181 Km of length, and it runs from the very South of Gaza strip to the Sayarim Junction in the South, which connects it to Road 12 to Eilat. All the road runs in parallel to the Israeli-Egyptian border.
The road is closed most of the year to the general public because of the activity of very violent smuggler gangs in the Egyptian side of the borders, who sometimes open fire on the Israeli army or people in the border to be able to get in and smuggle drugs and arms into Israel. However, during the Jewish holidays of Passover, Sukkot, and the Jewish New Year, the army takes special security measures and opens part of the road for public visitation. And yet, although it is only a small part of the road, it is the most interesting part, with the best views and a stunning geography.
The following is my Google Timeline from yesterday, when I joined the BMW Motorcycle Club for a visit to Road 10:
If you look at this from a closer perspective, this is how it looks like: