To help stay out of the muddy ditches. That truck on the left is in it pretty good. most people owned a pair (2) of chains, and putting them on the right would keep the ditch/crown of road from getting you. one to steer, one to drive. The middle truck is chained on the rear. That road is so slick, and prob a one lane path. Every time you meet another, ya both get to go in the ditch to pass. If you were rich and/or full on adventurer, you'd spring for the second pair of Weeds and chain up all four
Understeer must have been an issue. And probably oversteer. And rain. And cars with only rear brakes. And trolleys. Basically wagons with engines.
American-type 315, from the heaviest class of 4-4-0s ever built, with Reading–Lancaster local train 901 at Shreiners, circa 1940.
the only woman race car owner, manager or promoter during the 1930s and '40s, Portland’s Dorothy Hylah Gruman, whose team raced midgets and big cars under her Duchess Racing Team in Oregon and California