- A Washington State Department of Transportation study surveyed total development costs for various highways and bridges. Costs range from $1 million (for rural highway widening) to $188 million per lane-mile (for Boston’s Big Dig).
- The Washington State Department of Transportation report, Complete Streets and Main Street Highways: Case Study Resource provides typical costs for various roadway design features, including sidewalks, bike lanes and lighting, as illustrated in Figure 5.6.4-2