If you drove 120 mph down any highway

[Elk34]

I learned in traffic school the 15mph is for the crosswalk. Once you are past the crosswalk the speed goes back to regular school zone speed.
The backward sign on the other side means nothing, it's for traffic going the other way.
AND......
While off topic, but I also learned it in traffic school.
Did you know you can make a u-turn on a red light? Yup.
Key is obviously it has to be safe from opposing traffic plus you can't enter the intersection which is the area contained within the curbs not the crosswalk. So don't break that invisible line from curb to curb and you're good to go.

When you pass the cross walk and you have another sign pointed at you at 15 again it's for you. You are suppose to continue the 15 until end of school zone. How is the other lane suppose to read a sign from the back side if they can't see what's on it. Now I have only ran across a couple areas that have them. If the road you are on has a 200 meter school zone and there are multiple cross walks. Other wise the 15 is just until your vehicle completely clears the crosswalk and then you can resume the outer school zone speed what ever that may be. O by the way not suppose to pass in a school zone.

 

[Conelrad]

Lead, follow, or get out of the way...

Conelrad