What would you do

Tonight as I was driving home, I called 9-1-1 to report the following incident. 

I was cruising down Highway 50 westbound in the fast lane and I saw up ahead there was a smaller sedan at a dead stand still in the slow lane.  This portion of the freeway is currently under construction so there is a cement barricade blocking the right shoulder.  There is no break down lane.  And for some reason, there were no hazard lights flashing on this stopped car. I immediately thought, "Oh man, that is not good." And as I got closer, I saw that the driver of the vehicle was out of their car standing in front of it in the bright headlights frantically motioning for drivers to move over to the left lane.  I should also add that it was dark, and it rained all day today so the roads were wet.  As I passed the vehicle and driver, I watched in my rear view mirror and saw a car approaching the stalled vehicle, and was luckily able to slow down and move over in time to avoid a collision.

About 30 seconds later, I called 9-1-1.

I can't help but think - what IS the best practice if my car brakes down in an area that has no shoulder and I have no hazard lights?  I certainly do not think I would get out of the vehicle and try to wave speeding cars around me, especially in the dark.  Do I hop over the cement barricade and hope for the best??  Sit in the car and press on and off the brakes so at least the lights are flashing??  Maybe start with the simple stuff - 1) always making sure I have enough gas in the vehicle and 2) knowing precisely where the button is located for my hazard lights.