Purple pipes

[johnzo]

Now I am sure that the vast majority of Yorkshire pistonheaders will have enjoyed the M1 roadworks recently. Whilst sitting at 50 just south of Leeds a conversation in car went along the lines of ... "On the new central concrete barriers there's a purple pipe approx 100mm diameter, what's it for?".
Answers ranged from supplying ice-cream to others (unrepeatable). Does anyone know the real answer?

[LeighB]

Fibre optic connections to cameras for ANPR and other big brother duties no doubt?

Could be similar to this

[StuB]

That colour represents 'services'.

[skip_1]

Comms ducting.

[Sportidge]

With the colour, I always wanted it to be molten Cadbury's Dairy Milk....

[johnzo]

Hey. That's it, I bet that it is really Cadburys Dairy Milk ...

[skip_1]

Now you know why all the motorways fan out from Birmingham, secrets out!