This maneuver can work, but I think in many scenarios drivers aren't looking up the road long enough to see it; drivers usually pull up to a junction and glance briefly in both directions, so there isn't enough time for the motorcyclist to start the maneuver and be spotted.

The best advice I've seen for maximizing visibility is 1) have two headlights instead of one, 2) be mindful of your lane position, riding a little closer to the center line will maximize visibility at junctions.

And of course, never rely on visibility to ride safe. Defensive riding is always the priority. You should see and prepare for the dangerous junctions long before a driver needs to see you approaching it.

(Been riding for 8 years and no accidents)