Re: Stock 18" Tires and Tramlining on Grooved Highways
I hate to say it, the better your tire grips the road along with contact patch size will make this worse. You actually will want harder tires with less grip so to speak.
If you drive a high performance vehicle with good tires the problem is worse than a garbage Prius with hard super high mileage rubber. The better the grip the more that the road will try to pull you around.
Luckily there aren't many roads like that around here because it would be maddening.
I would go talk to a reputable tire shop in your area, you aren't the only driver on the road experiencing it, and hopefully they will have some options for you. The downside is a tire that reduces that tendency may very well be horrid on ice or in colder weather.