I like twin rear and front lights. Two lights on the rear stays or rack makes you look like a scooter and people give more space. Reflective sidewalls on the tires and something like a spokelit can greatly increase visibility from the side. Two in the front for me, one for drivers to see me and one to see the road. Vests or a reflective triangle or two can help, but I prefer active lighting. If you buy new clothing or bags etc consider how well it can be seen at night. Night and evening riding has brightened my wardrobe considerably.