Hi ivereson,
Your Uncle probably has a good memory of past experiences while riding in a Model A years ago.
I remember riding in our 1942 DeSoto, to Washington D. C., to Santa Fe New Mexico, going up Pikes Peak, etc., etc., in the late 1940's and early 1950's prior to today's interstates.
Many gravel roads in rural areas and also in small towns .... mostly stop signs in lieu of caution lights in small towns.
Cars jacked up with a flat tire, (out of sight), immediately on the other side of a hill, was a very common sight; as well as slow moving mule drawn and horse drawn wagons; cars parked in middle of the highway's drive lane because the person he was visiting did not have a car; hence, his friend did not have a driveway -- e.g., he just parked on the highway, at night, with "park lights" on.
Next, flats on tube type tires on cars driven were not at all uncommon.
Sixty (60) MPH in a Model A, with an unexpected tire blowout, on a gravel road, was a good speed for a total jackass driver, who at a minimum would need a change of underwear; but, only if he had an I.Q. of over 27.
Past actual experiences, just pat your Uncle on his back.