Hummingfrog, 300 photographs? That's an enormous lot even by today's digital standards. For the 40's it's prodiguous. Your father must have kept the local drugstore (if indeed they, like their UK chemist cousins, did the processing) in business on his own. At 24(?) pictures a roll, that's probably getting on for 15 separate rolls of film if his failure rate was anything like mine was (no auto exposure, double exposures, inadvertent exposures, etc). Given that he was kept busy doing his day job anyway, he must have been stealing every opportunity to capture this special and all too short experience.
Now thanks to his foresight, many many more than he could ever imagine at the time can share that experience with him. Thank you Hummingfrogs both!
The picture you post is immediately intriguing, as we might assume that the city limit sign implies that Terrell is in the direction from which the car is coming. Or perhaps it doesn't, because the 'State maintenance begins' sign implies that the State and not the City is responsible for road maintenance in that direction.
Perhaps it works the other way round, warning motorists approaching the sign that they are now leaving Terrell and that any potholes etc encountered from hereon in are down to the State and not the City. A little thing perhaps, but one that points up the many differences in doing things twixt here and there.