Why do dump trucks have pto warning lights and buzzers?

[Eric]

Why do dump trucks have pto warning lights and buzzers?

[IMG alt="The bed of the tractor-trailer dump truck apparently lifted up suddenly and struck an overhead sign on I-64 about 8:30 a.m. Wednesday. 




"]http://media.hamptonroads.com/images/news/64sign1.jpg[/IMG]
Now I know why! What a mess.​

Here is a link to the full article.
http://home.hamptonroads.com/stories/story.cfm?story=90504&ran=10294

 

[Tigerotor77W]

Wow... at least no one was hurt!