Yes, it’s Apple, or by extension, Tom Tom who provides the maps. However, I noticed if I route using the MapQuest web site, there’s an option to “ignore current road conditions.” A simple option, one I wish Apple provided. Please tell Apple to allow that option as well by using their feedback site: <
http://www.apple.com/feedback/maps_mac.html>.
If you’re interested, try routing with the attached file. Apple reports the “directions not available" error. Select Google Map from the RTP File menu, and Google will route it. Then click on 90 days from now, and the route changes to a summer route. Nice! Ironically Apple Maps takes dates as input also, but it doesn’t seem to affect their routing ability. I think it’s just used for traffic conditions throughout the day, not for seasonal changes unfortunately.
The bottom line, the more people that tell Apple about this, the more likely they should listen.