Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

With the help clues provided in the image, can you find the 5 digit key?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Find the value of "?" in the ball picture Riddle below:

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

You need to arrange three 7 and mathematical symbols to form number 1?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

What goes up but never comes down?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.