City riding lights - flash or steady?

flashing. It's way easier to judge how fast the bike is moving if it's flashing. It makes it stand out from any of the hundreds of other lights in view too.

Nope. Total opposite.

A bright steady light and a flashing light is the best combo. The flasher will attract attention, the constant will allow people to work out where you are and judge speed.

A very bright flashing light or a pulsing constant is the worst thing you could have as they're so distracting to other road users that they can' actually see you. Like driving along with the headlights on full beam all the time.

I say this coming from my pov where I ride to work every day and drive a lot for my job so get to see it from the cyclist's and the driver's pov.