The info in that link is very interesting. My very limited experience with the traction of studded tires on dry and wet roads is quite a few years old, and the traction was poor.
The concern about highway departments and wear on the roads vs. safer driving is well expressed in the article in that link. The total cost to all of us is safer with safer driving, even if that means studs and worn roads that need more maintenance, but everyone is worried about
their budget.
Yes, do dicker hard on tire prices. Last week I was offered 4 Blizzaks for the price of 3 by the local Firestone store if I use a Firestone credit card to buy them during October. I'll take that offer to Discount Tire for a match if I decide on Dunlops instead.
M+S tires, so-called mud & snow, meets certain geometric requirements for the designation:
" 1. New tire treads shall have multiple pockets or slots in at least one tread edge that meet the following dimensional requirements based on mold dimensions:
a. Extend toward the tread center at least 1/2 inch from the footprint edge, measured perpendicularly to the tread centerline.
b. A minimum cross-sectional width of 1/16 inch.
c. Edges of pockets or slots at angles between 35 and 90 degrees from the direction of travel.
2. The new tire tread contact surface void area will be a minimum of 25 percent based on mold dimensions.
"The rough translation of this specification is that the tire must have a row of fairly big grooves that start at the edge of the tread and extend toward the center of the tire. Also, at least 25 percent of the surface area must be grooves."
http://auto.howstuffworks.com/tire3.htm
Modern real winter tires are different. They are actually tested on snow for traction. These have the recent Snowflake-on-Mountain symbol.
"In order to meet this standard, tires must be tested using an American Society for Testing and Materials (ASTM) testing procedure described in "RMA Definition for Passenger and Light Truck Tires for use in Severe Snow Conditions":
"Tires designed for use in severe snow conditions are recognized by manufacturers to attain a traction index equal to or greater than 110 compared to the ASTM E-1136 Standard Reference Test Tire when using the ASTM F-1805 snow traction test with equivalent percentage loads.
"These tires, in addition to meeting the geometrical requirements for an M/S designation, are tested on snow using a standardized test procedure.They have to do better than the standard reference tire in order to meet the requirements for Severe Snow Use. "
(link above)
With what we've seen here, if I lived in a place with frequent snows, or absolutely had to get out regardless of the road condition, I'd get modern studded tires, probably Nokians. That probably includes Bend and the Portland metro area with their periodic ice storms.