[H. L. Chauvin]

Lots depends on what individual drivers may assume to be comfortable Model A speeds; and even though comfortable speeds vary with modern cars, many different mph answers depends sometimes on highway conditions and Model A capability.

For example:

1. Heavy traffic or light traffic?

2. Woods both sides of highway with few or lots of deer or Elk crossing? ... No pun intended.

3. Houses or businesses both sides of highway with half blind senior drivers and texting teenagers entering and existing driveways?

4. Smooth roads, rough roads; few stop signs/traffic lights or many of same?

5. Maybe a wild guess at a General Rule of Thumb for only "Highway Conditions" may be:

Comfortable Model A Speed = Comfortable Modern Car Speed minus (5) to (10) miles per hour.