This is something I get quite annoyed about because sub-standard cycle lanes are far worse than no cycle lane at all. Most of the cycle lane provision in this country falls well below the standard specified in the
DfT’s own guidelines.
Regarding width, most cycle lanes do not meet the minimum acceptable width of 2.0m (or 1.5m on roads with a 30mph speed limit) specified in section 7.4.2 of those guidelines, and a large proportion fall seriously short of this standard, having widths of only 0.5m.
In cases where there is a local restriction to carriageway width, a significant number of cycle lanes are designed to preserve the quality of the main carriageway rather than to preserve the quality of the cycle lane as specified in section 7.4.3 of those guidelines. In such cases, the width of the main carriageway should be reduced in order to maintain the cycle lane width.
Much of this seems to be the result of a misunderstanding on the part of designers regarding the purpose of advisory cycle lanes, which is not to exclude motor vehicles from that part of the carriageway, but rather to indicate to drivers the amount of space they should be leaving when overtaking cycles, and to emphasise that priority should be given to cyclists in that part of the road.
When a council does put in a cycle lane of the correct width, you get ignorant people wailing in outrage, as in
this article. A Daily Wail article on the same lane calls it "Britain's barmiest bike lane", and continues with the usual DM ignorant diatribe. The Telegraph article ironically shows a picture of cars using the cycle lane correctly in the absence of a bicycle:
If there were a cycle in the lane, then motorists should wait for a gap in the oncoming traffic before passing the cyclist completely outside of the cycle lane. Simples!
EDIT. Damn; Gaz beat me to it! However, that silver car in his picture should not be in the cycle lane at all.