Here's a fly-through of whats proposed. I don't fly, so I'll walk through it in the text below.
Spiffy space-age graphics make everything look so nice, don't they?
First things first - we do need to improve those routes, but why such short sections? And why, on Huntingdon Road, just on one side? Great, give us segregated infrastructure to take us to places of work out there, places where people live, but what about the return journey? If its only good on one side then its not good enough. 1 out of 10, right there, you've let cyclists down completely if you only make half of their trip safe. And if you're going to do it, do the whole road. Do the whole length of it. Don't give us piecemeal provision any more - make cycle routes for whole journeys, not small parts thereof. Any cycle trip can only be as good as its worst junction.
Now, on to the thorny subject of 'floating bus stops' such as you'll see 50s into the above video. Bus chaps
think they're crap but then they would, wouldn't they? Its their job to get for the best for buses, not whats best all round, and as such comments from Stagecoach need to be taken with a pinch of salt. I'm not opposed to the floating bus stops but quite obviously we need to get wheelchair and baby buggy access right, and the idea of putting the bus stop on the pavement rather than on the floating island is folly - we can't have pedestrians milling in the cycle waiting for a bus or crossing
en masse at the approach of a bus, thats not good for pedestrians or cyclists. Or the bus drivers waiting for the sorry mess to sort itself out, for that matter.
Move forward to 1:15 and you'll see the second place where things start to fall down. Yes, plenty of room for cyclists there, but I promise you, telling an inexperienced or vulnerable rider that they need to pick the middle lane of three with a car either side of them will not work. I know plenty of supposedly confident adult cyclists who will not ride over Hills Road bridge in either direction because of the employment of this non-solution. Doesn't work, won't work, fix it.
After that junction we move from a lane separated by a kerb to a raised lane. Clearly full segregation is better - the double yellow lines won't stop delivery drivers parking in the cycle lane (neither the Police nor the County police this at all well), meaning cyclists will have to go around, on the road. Down a kerb and up a kerb, with a parked vehicle restricting space and visibility. This is a half measure, and should be removed from the scheme - give us proper segregation, lets not go to such pains and fail on this point.
Move forward to 2:17. What the heck is this? Crossings are good, but how am I meant to ride this? Are we meant to get two way bike traffic between the gap there? Am I going to be looking pedestrians in the eye as they wonder whether I'm turning right before or after the zebra crossing, with them thinking I'm playing chicken as I turn in to the narrow part at the last moment, eyeing up pedestrians, cars behind on my right and oncoming cyclists who may or may not be turning at the same time? Or do you want me to stop entirely and cross like a pedestrian? Come on guys, there has to be better than this available. Move on to 4:10, and you'll see that whats meant to happen is that the motorists are meant to give way to us there. Why would they? You're saying I look, indicate right and the motorists will stop? Will they hell as like. You're treating cyclists like third class road users with this dreadful crossing idea. Its badly thought out and obviously dangerous to the point where it'll look safe because no one will use it as you envisage.
On to Hills Road (4:50) - the lanes simply look too narrow. You want to segregate off the cyclists into a route only wide enough to ride single file with a kerb preventing cyclists overtaking each other, on a major throughfare? That simply won't work. Wider. Space to overtake. Some cyclists travel three times the speed of others - this is normal, legal, and reasonable. Accommodate that.
All in all these schemes look really shiny in the footage, but the devil is in the detail. We need provision to turn right at all of the turn offs to places of work, from all the curbed lanes - is that included? We need junctions that really do allow us to get across without spooking pedestrians and without playing chicken with motorists coming up rapidly behind us.
This is so close to being an excellent scheme. But strip away the sci-fi shiny presentation? Its a classic example of Cambridge cycling provision. Just not quite good enough to encourage non-cyclists to ride. We're good for cycling by British standards - this is another example of Cambridge not seizing the opportunity on a global cycling provision stage.
Edit: As pointed out by Hester below, mostly the lanes we're looking at are 2.1m to 2.7m wide. If we're going to put kerbs in place to segregate cycle lanes from the main road, we absolutely must make them wide enough to allow overtaking - 2.1m won't allow that. 2.7m will BARELY allow it. Make them wider if they're kerbed off otherwise this won't work well.
Edit 2: Anna has commented below that with the iron-mongery you get at the edge of roads, we could end up with hazardous, wet drain covers, man holes etc. in the kerbed off cycle lanes. I suggest that before sayng 'yes' to this scheme we must require that these are removed to the main carriageway.