Cycling in Sydney Australia
Just a heads up. The new(ish) "courses" feature. Some smart person has added Pyrmont Bridge, a 10km/h "shared zone", to the courses system. So now if you log a public workout that crosses the Bridge, your speed becomes a matter of public record.
When I checked it a little while ago, there was an average speed of about 40km/h showing up on the leaderboard, and several more down in the mid-30s (one of which, I will hold up my hand in guilt, was me. I was late for work. Also, I'm a hoon, or something)
This shared zone is pretty contentious, with "pedestrians rights" letter writers regularly waving their hands in anticipation of a major accident and agitating for a bike lane, which I think would be a bad thing.
If you're using MapMyRide or anything similar (BikeBrain, Strava, whatever), can I suggest that you:
a) Ride within the limits
b) Choose a slightly different route which doesn't have the 10km/h restriction
c) Make your workouts private by default
I don't think we actually want to lose Pyrmont Bridge or have it policed in a more draconian manner than it already is.
I know it's basically impossible to keep to 10km/h, but let's not give any more ammo to the walker brigade
This also applies to other shared and controlled zones, of course.
If that is your technique, no wonder you are slow up hills. ;-)
Then you won't mind publishing your strava traces, Michael? ;-)
But seriously, I'd rather watch where I'm going than watch my speedo. And I don't cross that bridge in rush time - I guess if I did I'd find 10km/h easier too.
Still that's not really the point. The point is not only do riders break the speed limit, but a popular service is publishing records of the fact and it's not a great look, so we should stop doing it now, thanks.
How do you know what speed you're going if you don't have a bike computer?
The bridge is a fixed (and known) length - so all you need is a watch? Or a sextant (if riding at night). Using a sextant to measure speed is a sure-fire way to never exceed 10km/hr.
Reminds be of the university physics exam which asked the question "You have a protractor and 1m ruler - how would you go about estimating the height of a 30 storey building?". One student had to fight for his marks explaining that trading the ruler for a stopwatch and dropping the protractor from the top of the building, using the stopwatch to time how long it took to reach the ground, and entering it as t in h = 0.5g x t^2 was indeed a valid estimate.
Oh yea I usually have that sort of science going on in my head when I cross a bridge with a 10k speed limit :/
Yes I could work that out but what I'm really saying is that most bikes that don't have speedos are not stopping to consider their speed so scientifically. They'd just be riding. Maybe slower. So how can you enforce a speed limit on someone without a speedo?
I would recommend any riders do a little experiment in how they judge speed. Try and ride at what you think is 10km/h, without a speedo in your line of vision. Hold that pace. Check your speedo.
Try again after approaching quick-ish. Try again starting from a standstill. Try again starting at 10km/h and maintaining it without the speedo.
I've tried it a couple of times this week (after conversations on this thread), turns out I'm a really bad judge of speed, and I think most riders might be similar. generally, what I think is about 10km/h is about 16-17km/h, sometimes higher, sometimes lower, but usually higher when I've approached quickly. From a standstill, I'm more likely to get close, it seems.
If there was LIDAR, I'd be skint.
Thanks for the heads up, Jason, and sorry for the surprising amount of acidity in some of the replies. There are plenty of people here that happily whine about Harold Scruby and his pedestrian council, and they probably got the point you were making. We are all pedestrians at some point, it's just that some of us ride bikes too. If that bridge was empty, you'd catch me cooking across there too, which is technically illegal.