barricade barricades communicate flash flashing light lights orange street street sign warn warning white aged city danger grunge paint surface traffic urban wear barrier coastal defence defences erosion rocks sea clouds fence plants sky water wave wire construction flasher lens safe safety sicherheit sicurezza sikkerhed texture veiligheid yellow barbed wire barbs double fencing gray grey metal protection razor wire restraint security security fence sharp silvery spirals strands twists appearance barbed-tape barbed-wire injury razor-sharp razor-wire security-fence angle angles bright caution cracked cracks holey linear lines mesh perspectives plastic protect protective secure textures thick thin twisted