I think both shouold be used, the concrete woiuld fit in better in areas with more modern architecture. The steel ones like the Paris metro would fit in better in historical areas like Stephens Green and Westmoreland Street where as concrete might be better for O'Connell Street because of it's modern Style pavements etc
In response to what it described as â€œa growing problemâ€, the Home Office launched the National Metal Theft Crime Unit last month. The unit aims to clamp down on rogue scrap metal dealers who handle stolen metal.
â€œGlass is a very attractive material, but it can effectively be used as shrapnel. We can do things â€“ forms of lamination, how you fix it to frames â€“ and the difference it makes to the level of casualties is absolutely dramatic.â€