Remember PeerDrivetm? Well, either TomTom has stolen my idea and gave it a twist to make it work, or my idea wasn’t so new and revolutionary to begin with (pick your version).
TomTom has recently implemented a new feature in their GPS devices called IQ Routes. To quote:
“This new improved technology calculates routes based on the real average speeds measured on roads every day compared to speed limits. This uses historical data that TomTom users have been adding to over the years. It will always provide users with the smartest route hour-by-hour, day-by-day, saving them time, money and fuel.”
Pretty darn clever idea, even if I say so myself. 
This is a blog post from Adamus.nl.