Jaydesmum, they may not have seen them. If sitting behind a bus there is no way you can see what is in front of the bus.
oh come on - get real. There are huge illuminated signs, a severe restriction in the width of the road (which can be seen regardless of how closely your are tailing the bus) and the road surface has been STRIPED to provide further indication that this is not a normal roadway!
There is NO WAY these incidents are accidents - they are ALL people deliberately and with prior calculation attempting to bypass the system and knowingly drive on roads that they are NOT permitted to drive on! Good on the engineers for finding a way of getting the bollards to work fast enough that these 'cheats' cant get through!!
..and another thing - I bet after 1 week of this being in place EVERYONE in Manchester knew about it (via news reports, viral emailing of clips like this etc etc) and NOBODY attempts to follow the buses any more!!..
Well done Manchester! great idea!