FHWA's Infrastructure Carbon Estimator is a spreadsheet tool that estimates the lifecycle energy and greenhouse gas emissions from the construction and maintenance of transportation facilities. The Estimator requires limited data inputs and is designed to inform planning and pre-engineering analysis. It can be used to address these types of questions:
The tool is based on a nationwide database of construction bid documents, data collected from State DOTs, and consultation with transportation engineers and lifecycle analysis experts. Further details on the Estimator can be found in the Final Report and User's Guide. A June 2017 webinar provides an overview of the tool, including a general background, information on the underlying data and analysis, a brief tutorial, and some example use cases.