Why are there 2 yellow boxes on pedestrian crossings? (UK)?

Question

Hi there,

I have noticed recently that a second 'yellow' box has appeared at several pedestrian crossings. It is similar to the one in which you push the white button to stop the lights.

Does anyone know why there are two?

Answer 1

I found this and maybe it will help ????

There are two types of the yellow box installed at the pedestrian traffic signal pole by Transport Department.  

The first type consists of a vibrating unit located at the bottom of the box for helping the visually impaired persons (VIP) to cross the road by means of different vibrating patterns to indicate the prevailing pedestrian signal states.  

The second type consists of a pushbutton in addition to the vibrating unit. The pushbutton includes a 'palm' symbol button on the surface of the yellow box and a red display at the upper part of the box.

When the surface button is lightly touched by the hand of the pedestrian (including VIP and non VIP),  a sound is generated and a message in red 'please wait' will be displayed which indicate that the red  pedestrian signal will soon be changed to green for the waiting pedestrians to cross the road.