buldozer
http://www.youtube.com/v/_BXij7KYAys&hl=en
http://www.youtube.com/v/8BjgWPXO1gU&hl=en
scraper
http://www.youtube.com/v/jYOBPgBVmnI&hl=en
http://www.youtube.com/v/s_rxvdXIw7Q&hl=en
http://www.youtube.com/v/peeGEgTLivo&hl=en
http://www.youtube.com/v/yd0LfXHE5Xk&hl=en
excavator
http://www.youtube.com/v/jzNYN-3xQKc&hl=en
http://www.youtube.com/v/UVNgCzv0sZo&hl=en
clamshell
http://www.youtube.com/v/=6bdGiGL1Lb4&hl=en
motorgrader
http://www.youtube.com/v/BfBzVwpzvpk&hl=en
