Hi Freddo,does it have to be on the road surface or could be some sort of vehicle,if so Cadillac? Only because it has Cd, roman numerals for 400.Cant fit the glowing bit though!
Could this possibly be CD Plates.
car reg plates on diplomatic vehicles. A hot plate (e.g. on an oven could be said to glow). answer is 8 letters bt not really one word. over to you.
Thankyou to you all for the suggestions. Ive already got answers involving lamp posts and clamps. I can think of lots of glows but it is the 400 bit ...must have CD somewhere in the clue and the wording "we hear" must mean sounds like. Will continue to ponder...I like CD plates but not sure if that could be a continuous 8 letter word.