Construction hazard warning sign

1024 × 768

Warning Sign with Text — Gray, Serious

1680 × 1050

Radioactive Warning Symbol — Yellow, Illustration, Black, Grunge

1280 × 1024

Radioactive Warning Symbol — Yellow, Illustration, Black

1600 × 1200

Anomalous Materials Laboratory sign

1680 × 1050

Barking Dog Head

890 × 600

Rusty 'Außer Betrieb' sign on wall

1280 × 1024

Red Heart Sign

3000 × 2140

Yellow Caution Sign — Cautionary, Photograph

1600 × 1200

Speed bump ahead warning sign

1024 × 768

Warning Sign on Fence

1280 × 800

Warning sign ahead

800 × 600