Are my Winter tires safe?
So a few days ago I installed my trusty winter tires for the upcoming weather. I was in the process of getting them installed on my vehicle when I noticed several small cracks running along the vertical tread line, along with a single line running across the sidewall. I addressed these concerns to my installer/mechanic who assured me that they were simply "weather wear' and that I could easily get two more seasons out of them. Leaving the shop, I wasn't completely satisfied with my installer's answer, so I stopped by another shop to get a second opinion. They also suggested that I was safe to drive on them. To give more context, I have had them for a few years now and was expecting to maybe get one more winter out of them, but after noticing the cracks forming on the tire, they have really worried me to the point where I have placed an order for a new set of tires which will arrive in a week or so. My only question is whether or not I am safe to drive on them for a few more days? I have already started taking precautions such as taking roads with a lower speed limit rather than the normal commute to work I take using the highway. I have attached pictures to this post for you to get a better idea of my situation. (205/65r15)
Any help will be greatly appreciated!