Fall riding challenges:
Fog. Always dangerous no matter what you ride/drive/fly or sail. Extra dangerous for MC riders as our vision and visibility is dramatically reduced. We are hard to see front and back, more attention to what's coming from behind, monitoring of traffic speed, and keeping an exit plan in mind.
Blinding sunrise/sunset: The sun is lower and can be blinding for about 20 minutes early and late. Most caution in heading in the direction of the sun and at intersections.
Black Ice. Possible at S roads running alongside open fields.
Grip. Below 7c MC
tires lose a lot of grip and no matter how hard you ride it's impossible to keep
tire temps anywhere close to optimal. You lso have to deal with debris (leaves, mudding), enough sun to evaporate dew.
Driver awareness: As the number of bikes diminish from fall roads, as does driver awareness -- they forget about motorcyclists really quickly so extra attention to your speed and other driver's action/behaviour is a must.
AGATT is also a good idea this time of year. It keeps you a bit warmers and considering the increased chances of a riding mishap you can keep more skin.