How are these done?

[silverfoxcc]

Found this site

http://londonist.com/2015/05/london-sleeps-photos-...

Now while i have lost track on the advances in photography over the years , these puzzle me

Whilst it can be reasonably assumed that the majority are long term exposure

Texture of the Thames

Car light trails

People sitting in Trafalgar Square

I am at a loss as to how it was done, esp of the one taken on Westminster Bridge where the hands on the clock appear to show no movement

Is it all digital jiggery pokery?

[silverfoxcc]

Thanks Dave didnt see that

Now it is all clear!!!