The angle φ defines the direction of optic flow, φ = 0 or π generates radial motion (outward and inward, respectively), φ = ± π/2 clockwise and anti-clockwise circular motion.

The Magic Roundabout in Swindon has been ranked as one of the UK’s most “stressful” junctions. A new survey of 1,000 drivers found that the iconic landmark placed second, just below the ...