Old version project map use web appbuilder,
https://odp.dot.ca.gov/sb1/
select. SB1 first, then click refresh button
New version project map use experience builder
https://rebuildingca-project.dot.ca.gov/CaltransProjectMap/
There is no way to filter sb1 project on new expereince builder. This is major knowing issue. SB1 project is the most important, major, fundermental funding program in all caltrans projects. This issue will be resolved in the future.
Alternatively, you can see all SB1 project from here
https://transparentgov.net/json2tree/datahub.io/embed/multilayerMultiSelect.html?layer_id=6&layer=State_Good_Repair_sum&url=https%3A%2F%2Fodpsvcs.dot.ca.gov%2Farcgis%2Frest%2Fservices%2FSB1%2FSB1_Projects%2FMapServer&_center_zoom=6&_center_lat=37.85541180953609&_center_long=-117.04221777548041&selectedItemIdArray=6
Click it, Interactive map for California DOT transportation funding by SB1 project