This image shows the boundary fence, and in the distance, a series of telephone poles, outlining the Bonneville Salt Flats near Wendover, Utah.
The description states:
BONNEVILLE SALT FLATS
A view from U. S. Highway 40 of the famous Salt Flats, “Worlds Fastest Speedway.” in the Western edge of Utah. The crystalline salt body that makes the famous Bonneville Flats Race Track covers and area of 200 square miles.
–This salt flats is the largest of several such areas located in the lake bed of the extinct Lake Bonneville.
This card likely dates from the 1950s.