We drive on the left side over here in Tokyo. The bike lane is the outer most edge alongside the curb. Along that curb cars and trucks park for deliveries etc, taxis let off their passengers, etc etc. So you have to give wide berth to these stopped vehicles to avoid a door crash, yet maintain enough distance from moving vehicles alongside and approaching from the rear. It’s a pretty hectic and dangerous dance. I’m surprised my wife still allows me to ride on the road paths. I have the Varia alerts coming through my helmet speaker, which directs my attention to a proper motorcycle mirror. I also have the Varia display on the phone. I would say the safety that the Varia gives me is 1000% better then without. I bought the one without a light. It’s fantastic value!!
Lately because of the pandemic I only ride at early AM at dawn hours. I even have a laser beam light for that hahahaha.