Blood on the streets

Do cyclists also need warning signs that there may be pedestrians crossing, doors of parked cars opening, other dangerous road users etc etc?

Measures such as enforcement of the law, strict liability etc would probably make more of a difference.

Eh, the signs were an afterthought. The main point was that there would be a waiver system for firms that had a good reason to need to bring trucks into the centre during the day, but most everyone else would be on a Paris timing system.

Which isn't suggested as a replacement for measures like strict liability. Just a side-argument about whether banning trucks from the centre in daylight hours would necessarily lead to the collapse of human civilisation.

Edit to PS - TFL already put up signs to alert drivers ahead of road closures and other disruptions, the sign idea was meant more in that vein.