Let's do the time warp

If you get off the tram at the Graham Street stop, you'll find a sign pointing towards Bay Street suggesting an estimated walking time (downhill it would seem) of four minutes...

...then approximately 2 minutes later when you're beside the beautiful overpass, having walked in the indicated direction, you'll come past this mathematically puzzling sign (and the sky may suddenly cloud over)...

So the inevitable questions are: What route did the person who came up with the 4 minute sign take to achieve that time? Was there once a little skate board beneath the little man's feet? Did the powers that be worry that an accurate 8 minute estimate might deter visitors drawn to the shopping Mecca that is Bay Street from actually disembarking? Or is this one of several wormholes lurking within the district?