Near Appleby line, 3 bright white rapidly blinking lights; VANISHED, only to reappear further away moments laterTravelling north-west on Appleby Line, towards downtown Milton. Off to the right (East) was something in the sky. It was dark out. The object was about 5 kilometres away and perhaps a thousand to fifteen hundred feet up (perhaps at 20 degrees rise from the horizon). There were three bright white lights, each on for about a third of a second. They took turns turning on in rapid succession. The object had one pale white light on the whole time, about centered.Other airplanes were flying in the area, at least three were preparing to land at Toronto Pearson airport, 30 km to the East (they had their headlights on in the clouds as they approached overhead). This was NOT an airplane. It seemed not to travel in any direction. Two of us saw this. It then vanished. A few moments later it appeared further away, maybe 8km? and at ten degrees to the horizon (just a hair above the faraway trees). We were driving this whole time, then lost sight of the object. about 2 minutes elapsed.P.S. Never have I seen questionable objects in our skies, but three times now it has occurred in the past four weeks! And this time I was not alone!!