4th St. has been a bike route on LA's general plan for decades and is a key East-West corridor for cyclists connecting between DTLA and the Westside. Despite this, very few improvements have gone into the ground to make it safer for people riding bikes. LADOT is currently working on creating more low stress corridors for biking and is looking for feedback from users in conjunction with their 4th Street Neighborhood Greenway project.
If you bike on 4th St, please fill out their surveys for intersections at 4th/Highland and 4th/Rossmore. Let them know how much it would mean you to have a signalized crossing for bikes at these intersections, similar to what was put in at Rosewood/La Brea: