Besides the obvious, which is they don't want anyone in there for their own safety, how do you traverse slippery slopes in the winter? I have experienced great success using a device called Kahtoola's Micro Spikes. They worked so well, I bought a pair for my wife, my kids and their spouses, and even friends. They fit on your boot nicely, and bring traction to your feet using 1/4" V-spikes.
I've used these extensively for the last several winters, and they are worth every penny. My wife and I have hiked in so many places that simply were not accessible any other way. I've had more than a few times wearing them was my only way out.
Ultralight Paddling Pickup address: 1769 Route 300 Newburgh, NY 12550 845-863-3452 (Please leave a message) E Mail: UltralightPaddling@gmail.com Sales by appointments only... to ensure you get exactly what you want. Call or email today! Return policy: Once the canoe is in your possession, we do not allow returns. There is no expressed warranty from Slipstream Watercraft, nor Ultralight Paddling. But if something is not right for some reason, we will try our hardest to fix it. If you damage the canoe while using it, Slipstream can very likely repair it for a modest cost, but you must pay for canoe shipping to/from Slipstream waterworks. Please contact us first.