According to this Clean Technica article infrastructure projects that incorporate bicycle and pedestrian elements create about 46% more jobs than road-only projects. The study it quotes states:
Using actual bid price and cost data, the study compares 58 projects in 11 cities and finds that bike projects create 46% more jobs than road projects without bike or pedestrian components. On average, the ‘road-only’ projects evaluated created 7.8 jobs per million, while the ‘bicycling-only’ projects provided 11.4 jobs per million. For example, a roadway-focused project with no bicycle or pedestrian components in Santa Cruz, California generated 4.94 jobs per $1 million spent. In contrast, a bicycle-focused project in Baltimore, Md produced 14.35 jobs per million. The PERI reviewers attribute the difference to the simple fact that bicycle and pedestrian projects are often more labor intensive.”
When you add in the additional benefits of less pollution and a healthier citizenry why aren’t pedestrian and bicycling elements included in every large scale road project?