Brisbane

10 km/h is remarkably slow. How exactly is a bike without a speedometer not supposed to exceed that?

I'd really like to see the speeding fines formally challenged in some way. You hear stories from cyclists that they or their mates have had them overturned, but I haven't seen any actual evidence of this. Maybe it's the case that police just choose not to proceed when the fines are challenged, and avoid setting a formal precedent in the courts.

It would also be interesting if this specific case was challenged. Like you say, it sounds like the 10km/h is supposed to be advisory, but the sign they have used is a regulatory sign which can be enforced by a literal reading of the rules. Not sure if it would hold up in court, and might come down to the judge's attitude towards cyclists.

If they want a 10kph speed limit they should probably make it a pedestrian only bridge. 10kph is simply way too slow a speed to safely manage a bike.

Big car is scared of bikes, the real personal transportation device

Yeah. This basically sounds like you're supposed to dismount and walk across the bridge. The pictures in the article show a walkway shared between pedestrians and cyclists going in both directions. It doesn't look wide enough to be doing 26km/h if there are pedestrians and cyclists about going in both directions.

26 kph or 16 mph is not a difficult speed to hit on a bike, especially if you are in good shape. I am not in particularly good shape and I cruise even on my mountain bike around that speed. If the path is crowded and I'm dodging people, sure I'd slow down considerably, but who's to say they didn't clock him when he had some free air between groups of pedestrians.

I admittedly didn't read the article, but that's faster than I expected from the headline. The title makes it seem like he was at a crawl, but now I'm like, which joggers were running faster than 16MPH?

You don't need speed limits for this. Cyclists are more than capable of riding to conditions and either slowing down or going around pedestrians. Fine cyclists if they're actually riding recklessly, not if they're going at a perfectly reasonable speed given the amount and proximity of pedestrians. The fact that there have been zero incidents recorded on this bridge pretty clearly indicates it's not a problem area.

better just ban bikes(and scooters) from shared pathways

It's literally called a shared pathway. The entire point of it is to allow active transport of all forms.

15 km/h on a bike lane is pretty slow, and a bicycle crashing into a pedestrian at that speed won't do much harm - if any. But agreed, on a the sidewalk it's still too risky.

I think here in Oslo there is no special speed limit on a bike on a road / bike lane, just the regular speed limit. However, if you are on a pavement or public space like a place etc, basically if you are among people, the limit is 6 kph. So, don’t pass people at over 6 kph. Sort of ok even if very few follow it unless they are forced to because of crowds.