My question involves a traffic ticket from the state of: California
I was driving east on Wilshire Blvd at the overpass at the VA Hospital (Wilshire Blvd at Bonsall Avenue) where there is an unmarked separated side lane (wide enough for 2+ car widths) which includes a bus stop. I was in heavy traffic and my engine light went on (I have had recurring engine light problems) so when I reached the side lane I entered it with the intent to temporarily turn off and rest my engine for a few minutes. A police officer had stopped and was citing another car and he motioned me to motioned me to stop (I had already pulled over to the curb and was stopping behind the other parked car before he motioned me to do so).
He cited me for driving on the shoulder. I replied that I wasn't aware that this was a "shoulder" -- there were no signs at all, and anyway I had to stop my engine briefly because my engine light was on.
What is the definition of "highway shoulder?"
Please advise if the officer's action is appropriate?