Many times bidding on a public works job is like a ride on an old outdated roller coaster.
You don't know if you will finish the ride or half way through be hurtled through the air only to land upside down. Needless to say the risks are great. As we all know, some projects do end up on the short end of if the stick. Materials are substituted, unskilled labor is used, inexperienced subcontractors are hired and, if this isn't bad enough, boilerplate specifications are used that don't pertain to the project. Talk about change orders.