Backache
Assistant Pro
They can use their discretion when the signs are clear , the nature of law in this country is that discretion can be used in the legal process. That is not the case in the Rules of golf where penalties are generally defined and mandatory.So the police can use their discretion when the signs aren't clear
The practicalities are that in events played under the rules of golf there is a duty incumbent on the commitee to suitably mark the course. If you are pitching up at a club to play with friends and the course is not well marked you are entirely free to ignore the rules of golf for your own private competitions.