Hi there, this is Mindy. Thanks again for bringing this concern forward to our team via SeeClickFix. We’re happy to report that your request has now been completed. After further review, this is Caltrans jurisdiction and they would be responsible for the implementation of any supplemental traffic control devices. Please contact Caltrans District 8 at (909) 383-4631. If you have any questions or concerns about the completion of this request, we’d love to speak with you. Please don’t hesitate to reach out to us at (951) 736-2266. Thanks again!