This is the second one, and it alerts the operator to one and a half more miles of steep grades and sharp curves. After the installation of the two signs, the number of runaway trucks has diminished to about half of the previous level.
The 1959 standard changed the background color from black to green on these classic California signs – one of the longest styles in continuous service. San Bernadino County Line highway sign. Would you like a number not seen here?.