alternative cell conservation electricity energy environment environmental equipment fuel gas generation global green greenhouse Harness heat nature panel power solar black black on white direction law no alternative one way one way signs only sign signs specific street signs white alternative power bread corn don quichot farm house landmark landscape mediterrane mediterranean Pyrenees south france Spain tourism wind windmill access denied denied directions no standing no temporary parking not allowed not permitted parking permission denied prohibited prohibition red warning enery green energy panels renewable energy roof solar electric solar panel sun alfresco dining alternatives Asian bowls chinese choices chop sticks cooking customers diet diets diners eatery eating eating out food food areas food bowls food hall hawkers stalls open eating area people Singapore variety arrows blue communicating communication directional divergent diverging indication no-alternative pointer pointing splitting splitting-up street-sign traffic traffic-flow traffic-sign turn turning two-way