Besides the hi-vis clothing and lights already recommended, get yourself a rear view mirror. Then position yourself near the center of the lane, and monitor traffic. When oncoming traffic is present hold your ground so overtaking traffic behind you will have to slow for a few seconds instead of squeezing by. Add slow/stop hand signals and look backs when necessary. When oncoming traffic is not present you can glide slightly right to help facilitate / encourage a pass by overtaking traffic once they are near.