Here is a close up of the three different sizes of bridges. The small bridge is about 2" wide. The medium bridge is about 4" wide and the large bridge is about 6" wide. I currently only have the 4" and 6" bridges in the shown style. The 2" bridges have three different styles.
This is a Kickstarter update for the Farm Set, link: http://www.kickstarter.com/projects/1368936178/wargame-terrain-for-table-top-games-farm-set/posts?page=3