Free images results:

Safety pictures, stock photos and images

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Safety sign Stock Photography
Author: Freds
Safety sign Stock Image
Author: Freds
Warning Stock Photo
Author: Marilyna
Barbs Stock Photography
Author: Gautier
Matches Royalty Free Stock Photography
Author: Wallacedb
Portrait Stock Image
Author: Abdone
Barbwire Royalty Free Stock Photo
Author: Belka
Portrait Royalty Free Stock Images
Author: Abdone
Lock and key Stock Photo
Author: Ice
Watchout Stock Images
Author: Slidepix
Twist Stock Image
Author: Mlevy
Ant Workers Stock Images
Author: Lycan
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Also, here are some commercial RF-licensed images that match your search criteria:  
Car Safety Royalty Free Stock Photo
Author: Mshake