The purpose of this project is to evaluate how select categories of bridges restrain vehicle loading and how those results compare to existing analysis procedures and the North Carolina Department of Transportation's (NCDOT) current computer rating programs. This project was funded by the NCDOT to verify if the programs that are used to load restrict certain bridges are truly modeling the actual bridges performance. These load restrictions can restrict trucking routes and have an economic impact on regions serviced by those areas; therefore, the NCDOT wants to eliminate any unnecessary or inflated restrictions. Three bridges were tested during this project: a 67 year old reinforced concrete deck girder bridge, a 57 year old steel girder bridge, and a brand new continuous steel plate girder bridge that acts compositely with the concrete deck. The bridges were instrumented with devices that were capable of recording strain or deflection. These bridges were then load tested with vehicles that produced similar live load moments to the moments that caused each bridge to be load restricted. The data gathered from these load tests were analyzed and compared to anticipate results from hand calculations. A number of specific factors were determined for each bridge; many of the values were different from what the NCDOT uses in their programs. These test values were substituted to model the specific bridges tested more closely. The two older bridges performed much better than anticipated, while the new bridge modeled closely to hand calculations. Conclusions were made that the current NCDOT programs were adequate; however to better model a specific bridge, more specific factors would have to be determined. The recommended method for finding these bridge specific factors is smallscale load testing by the NCDOT.