A light pipe is a type of tube that is used to disperse or shift light.Light pipe can be used to send natural sunlight into a building they can be used to create artificial light within any type of structure.

a light source that is self generating is a water tank with a recirculating pipe from the bottom to the top with a turbine transformer in the pipe

light does not bend and can not provide sufficent amounts of light in for visibility

go to the back of the truck and find the exhaust pipe, point a flash light into the pipe. they are at the end of the pipe

the 02 sencers are in the pipe, if there is a problem with them it would cause the check engine light to come on but the pipes themselves wouldn't