beam brick building city column engineer equipment excavator foundation gear landscape master pillar sand scene strength strong work worker works background infrastructure iron maintenance metal planning power processing progress rubble structure texture tough winch working hard hardness cement carpenter concrete material concrete pattern concrete surface concrete texture construction metal nails nails nails on floor nails on slab platform scaffolding shadow wood deck wood grain wooden wooden deck busy in office computer program computer specialist computers engineer in office hard work keyboard laptops office work structural analysis white collar man work on computer bridge buildings bus buses control detour development double-decker buses empty excavation excavations fences fencing MRT overhead property railway redevelopment redirection roadwork safety Singapore space stairs steps temporary traffic vacant blocks walkway applications c-clamps carpentry cast-iron clamp clamping clamps colored coloring colors coloured colouring colours fasten fastening furniture-making G-clamps grip gripping hold holding multi-use screw-handle secure securely securing swivel-button tool tools tradesman versatile welding wing-screws woodwork yellowing accommodation angles architecture box-like boxed concrete distinctive drive driveway elements exterior external gray grey height high home house light linear lines modern modernistic perspectives plain squared straight structured style suburban units urban views wall walls windows access-denied advice advising alert apology appropriate-behavior appropriate-behaviour avoid behavior behaviour beware black care caution communicate communication concern construction-site danger dangerous entry-denied entry-prohibited inconvenience inconvenient information informing no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition restricted restriction restrictions risk risks risky sign warning warning-sign yellow