RORY: She’s [Sherry’s] very up on traffic flow and rush hour and all that.
LORELAI: She’s Rand McNally.
Rand McNally, publishing and technology company that provides mapping for both electronic gadgets, and for educational purposes, well known for producing school atlases and road maps. William Rand opened a printing shop in Chicago in 1956, and two years later hired Irish immigrant Andrew McNally; the two men founded Rand McNally & Co in 1868. The first Rand McNally map appeared in a 1872 railway guide, and their first road map was published in 1904.
Lorelai and Rory left Boston at 6 pm, on Sherry’s advice. That means it would be around 8 pm when they get back to Stars Hollow and egg Jess’ car.