I love the little quips about the whole off-duty at construction sites thing.
I do have a couple of comments on this though. Even if I believe that I do not agree that the police have the right to dictate the number of officers that might be required for the 'paid-duty' services that it provides, it is an essential part of the operation.
For those who are not aware, the use of 'paid-duty' officers is important at sites where traffic is present, because it is against the law to not stop for a police officer when directed to do so. A security guard has no lawful presence on public lands, exempt for municipal security on municipal lands. Therefore, they too have no powers on roadways. Hence for a matter of public safety, police officers are required.
I would also like to point out that crossing guards (as was mentioned earlier) are also members of the police service in Toronto. In a case like this though, it doesn't take a genius to realize that when you are driving past a school at 3:30 in the afternoon, that there are hazards that as a driver you have to be aware of. This awareness might not be the same while driving past a construction site where an overhead crane might be lifting a heavy skid of drywall or a large elevator motor which could potentially fall and kill someone.
For those that have noticed, I used 'paid-duty' not off duty. These officers are working, on behalf of the police service, which is being paid (majority of salary) by the contractor and not the tax payers. Therefore, it makes sense that they are in uniform while doing so. I refuse to classify them as off-duty because as a police officer, they are technically never off duty, especially whilst in uniform preforming some sort of function (useful or otherwise).