[thomseddon]

More likely it's just because there was a delay between the times the images were taken, hence now you see it now you don't. This is extremely common on Google Maps.

Edit: For example, click the arrow to go down the No Entry road: https://maps.google.com/maps?q=WF17+9LN&hl=en&ll=53.731781,-...

[bartl]

And you move even further forward and turn around, it's back again: https://www.google.com/maps?ll=30.613617,34.803708&spn=0.001...