What's interesting is that -as David Hembrow regularly observes- the worst parts of Dutch Road infrastructure are being picked up and hailed as fantastic. Shared space is one example, turbo roundabouts the next. Not only are they mediocre bits of the NL roadspace, when brought to the UK they don't come with the rest of the system: bypasses and road blockings to reduce traffic flows into the shared space and viable alternative cycle routes for the roundabouts.
The South Gloucs shared space project ended up resulting in the Great Wall of Filton: a barrier added to stop motorcyclists getting through, and out of fear of pedestrians being hit by speeding cyclists. Even on a back road converted from a rat-run to a quiet road, cyclists aren't welcome.
It's not too late for the cycling groups to recover from this one. They need to go the council and say "no cycling cash unless the new proposed DfT signage "elephants feet" crossing goes in and those Dismount signs go out", with some raised road to indicate right of way alongside the belisha beacons. That's imperfect, but an improvement on the current debacle. Could we get it? Not while Sustrans is still giving its support.
Which is why Sustrans needs to be kicked into shape. They have got a good engineering department, and have apparently helped with some of the Bristol infrastructure development. But their campaigning group has got stuck in the late 1990s, giving the seal of approval to unacceptable mediocrity that is never going to encourage mass cycling.
They need to look at their goals and come with a nice metric: cycle routes good enough both for the 8 year old with their grandparent -and the commuter in a hurry. What is being proposed on the turbo roundabout doesn't suit either -and instead is theft of cycling money to improve traffic flow.
We get next to nothing for our infrastructure anyway -now the roundabout builders are stealing it in exchange for some cyclists dismount signs, with Sustrans saying "It's OK, take all of it". If the Bedford
And the worst part? Those civil engineers think they are doing the cyclists a favour. They will think the turbogate roundabout is an improvement; they do think that an unlit underpass with barriers and dismount signs acceptable facilities. And they will think that cycling groups that whine about this are ungrateful. Why do they think that? Because Sustrans encourages it.