In reply to DR:
It's this reducing speed business that I don't understand. My work is a 38 mile commute, If I cycle I generally get the train for the first 12 miles or so then ride the rest, This already turns a 45 min drive into 2 hours so why on earth would I want to reduce my speed? It doesn't exactly encourage people to swap their car for a bike does it? 'Right guys, I want you to leave that nice safe, warm dry box, get on a hard saddle, work really hard, get wet, sweaty, take twice as long and put yourself in considerable danger - oh and by the way can you slow down a bit and take longer please?'
I ride most of my distance on trunk roads, a fair bit dual carriageway and definitely use the section behind the white line where possible, There is a four mile section with nice smooth cycle way/footpath which I don't use simply because the gates every 100 meters or so, pedestrians, kids, dogs joggers etc mean that to do so would put another 5 mins on an already long journey, not to mention massively increase the risk of a collision.
I commute by bike to increase my fitness and stamina, something that is not going to happen if I pootle along at two miles an hour. My best average is around 17mph (27kph) over the full 38 miles and as with all averages I regularly go a lot faster than this, not the sorts of speeds you want to hit a dog or child at hence the reason I use the road.
There is a section near the end where I feel genuinely safer doing just over a mile between two roundabouts on a 70 limit dual carriageway bypass than using the old road with its width restrictions and parked cars and school traffic and buses all fighting for space and none of them looking out for a cyclist. On the bypass I'm behind a solid white rumble strip, out the way of traffic and pedestrians.
If you want to make cycling a viable means of commuting outside of cities then you need two things, decent regular trains, and fast obstruction free cycle lanes. No one is going to seriously contemplate a commute of any real distance using the cycle lanes we have now unless they only work part time and can afford 4 hours a day to commute.
Post edited at 23:00