i've found the heatmap is much more informative looking if you tweak the colors in photoshop to create a bigger contrast between the most frequently ridden stretches and the less frequently ridden. in the case of mine (which is about 5 months of rides), the bright yellow over the bridge is probably 40 trips each direction, the oranges are 20-25, reds in the 10-15 and purples anything down to 1. i wish they had a more robust way to edit their heat colors!