The municipality is not going to be worried about claims against them. Sand on the road in Ontario is not exactly unusual and drivers should expect to find it at any time. The municipality is more likely to be getting complaints if they DON'T sand, not if they don't clean up the sand as fast as some folks want.
All they need to do to protect against any claims is have a policy outlining their road maintenance plan and then reasonably diligently comply with their plan. For example, they may state that they will clean road debris by sweeping the roads once every month, or two, or allow nature to take care of it with rainfall. All would be acceptable and within the norm in Ontario. If they do indicate they're going to clean, they don't need to do it all at once, they just need to use their very limited resources to work away at the task.
Sand on the road is primarily a hazard to motorcylists. For everyone else it's just a mess and therefore not the biggest priority for municipal road maintenance. They are far more worried about fixing potholes which are a major issue for all road users and that occupies most of their resources at this time of year.
I think the best method to ensure that sand hazards that are a concern to a motorcyclist are removed is to advise the municipality of the situation and then do what the OP is suggesting and get a broom and/or shovel out and fix the worst of it.
You are incorrect.
A road hazard is a road hazard. I know of the amount of gravel they speak of. It is on the road and in the drive line.
It is unsafe for all.
A well documented letter demonstrates they had knowledge of a road hazard and either they fix it or risk being sued if someone is hurt.
Insurance company would love a copy of said letter.
You also sue the person for negligence not just the city.
Nobody wants that kind of attention. Their boss does not want to be sued because they will all be out of a job.
Who will clean the roads if this guy moves away? It is not our jobs to do this, people make good money doing this job.
We pay taxes. We are not talking about the odd muffler on the road where yes, it's good for anyone to stop and clear the road. This is a constant state of danger. If said motorcyclist had crashed and said bike ripped a minivan in half killing a few kids, what do you think would happen then. What if that biker that low sided killed a pedestrian or a cyclist? Motorcycles become flying objects. It is not a matter of if, it's when.
To the OP, perhaps you can draft a letter, post it here and have a few people email to the proper departments.
I would also send a registered letter.
You may be helping someone else indirectly in the future pay for medical bills, maybe yourself.