helmet with face shield. You want to pre-treat the face shield with a substance like Rain-X
waterproof gloves
waterproof boots or ones that have been treated with weather proofing
Always check your bike’s tire tread and inflation before your ride
Stay aware, smooth and in control.
When stopping, apply light, even pressure, with a little more rear brake than front to avoid locking up the front wheel.
If you lose traction, steer through while staying off the brakes altogether. Braking over a non-tractable surface will send the bike skidding and fishtailing.
Slow down, increase your distance between vehicles.
Take turns a little easier.
Engage the most important safety tool - your common sense.