Usa Made

How is in USA made a sidewalk so smooth and with those linear transversal grooves from place to place?

Can give a specific site for me to watch pictures, please? Thanks

Here’s description:

http://www.ehow.com/how_16409_lay-concrete-sidewalk.html

Here’s some pics:

http://www.shutterstock.com/cat.mhtml?searchterm=pour+sidewalk&x=0&y=0

Party in the USA Cover – made by mouth, voice and tambourine – Acapella – Mike Tompkins