The City of Sacramento, Department of Public Works, has an map or dashboard of transportation projects available online, Public Works Transportation Projects. You can select by project phase (planning, preliminary engineering, final design, in construction, and construction complete), and by council district. You can zoom in or out on the map.

Clicking on a project line or point opens a popup with details. Some of the data seems a little out of date for Project Manager and project phase, but this is nevertheless the best source of information on projects that I am aware of.

For transportation advocates, selecting planning will probably be of the most interest. Once a project is past the planning stage, it is unlikely that it can be improved by community input.

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Sacramento County does not seem to have an equivalent map/dashboard, but it does have a project page.

Citrus Heights has a Multimodal Transportation Safety Plan (MMTSP) map that is similar, though focus on response to community complaints about particular locations, rather than large projects.

Folsom does not seem to have an equivalent map/dashboard.

Rancho Cordova has a robust set of GIS data, but does not seem to have an equivalent map/dashboard.

Elk Grove has a robust set of GIS data. It has a CIP (capital improvement program) map, which may contain similar information, but does not seem to be working at this time.