Why in the UK are there pedestrian crossings with two sets of indication signals - one above the other?

1. What are the different types of pedestrian crossings UK?
2. How many different types of pedestrian crossings are there?
3. What are the sensors on pedestrian crossings?

What are the different types of pedestrian crossings UK?

There are currently five types of formal pedestrian crossings used in the United Kingdom, these being Zebra, Pelican, Puffin, Toucan and Pegasus crossings.

How many different types of pedestrian crossings are there?

There are 5 main types of pedestrian crossing, with a couple of extra variations to consider.

What are the sensors on pedestrian crossings?

How they work. Puffin crossings have two sensors on top of the traffic lights – a pedestrian crossing detector (PCD) and pedestrian kerb detector (PKD). These make the crossing more efficient by detecting whether pedestrians are crossing slowly – which prompts the crossing to hold the red traffic light longer.