High vis does increase the chance of being seen, marginally, as do running lights. If you want to gain someone's attention when you approach a junction to the left or right, you can consider mild swerving/jinking so the movement of your lights gets the attention of the driver. As others have said, does all of this really help? One major factor to the problem is the sequard effect, whereby, people look, but don't see - this is one of the main causes why the vast majority of accidents occur within 5 miles of the person's home. The brain takes in images like a camera, and the quicker you scan, the bigger the blanks. The memorised images of the location you're familiar with will fill in the blanks. Anything within those blanks (bicycle, motorcycle, car etc) is not registered. The solution is to improve one's standard of riding.