Thanks. I didn’t see that.
It was for shelter, they were drafting the car so the car would break the wind. Very common practice.
If the the reported crash site is accurate, the riders had a very gradual incline to contend with along with the southerly head wind conditions. The crash site is reported to be at US 95 and NV 165.
Here is a cool website that displays US elevation changes.:
https://viewer.nationalmap.gov/advanced-viewer/