Look, I don’t know what percent of Hearties are panicking about this stuff, but I can remember one episode of When Calls The Heart when Elizabeth traveled from Hope Valley to her parents’ home, which was beautiful and filled with tons of historic detail… plus an asphalt driveway.
Suffice to say, the wonderful thing about When Calls The Heart is not its attention to period detail.
Asphalt was around in the early 20th century, so who am I to say it’s not possible they had an asphalt driveway?