Thank you all for your helpful input.
Per your comments, I've deleted the non-gas-station businesses. I'll look into correcting my gas station additions as I have time... to make sure I get them right.
As for Phyllis Ave. split... mea culpa. That was a (brief) venture I took to try to go beyond the parking lot. It was accepted before I learned the guidelines for not splitting a road. (I had figured, since there was a serious barrier between the two lanes of traffic, it made sense to split it, and clarify where/why side streets/drives would/wouldn't be able to make certain turns. I had not read the Wiki about split roads, and had failed to consider the lack of accuracy of GPS tracking. At this point, it seems like it would be more work to un-split it. And, unless there are any URs that I made errors in allowed/disallowed turns, I wonder if it should be changed.
Regarding the back-of-buildings parking lot roads... I'm thinking I'll try again to create the main ones. And also three of the entrances/exits... two to Phyllis Ave., and one to Pamela Dr. The other ones that lead to/from Grant Rd. would be problematic in that they would necessitate adding more (minor) parking lot roads/lanes which would likely create confusion.