I'm still trying to come to grips with what Health and Safety's response to that would be in the U.K. indeed in much of Europe ? 
The point appears to be painted hi-viz orange. A tennis ball on the end of the spike would probably be sufficient
Maybe in the 60's/70's, but now ? Doubt it if my local councils H&S departments behaviour is anything to go by

Safe access and egress, it's top level Health and Safety at Work Act stuff without getting into any of the umbrella regs. If someone got hurt, they wouldn't have a leg to stand on.
I had to do a NEBOSH course for a H&S role I used to do (fortunately managed to ditch it a few months ago), 3 months of my life I won't get back. That's the time the that relates to my self imposed 'ban' Chris! Horrible course.