Gooseneck street lighting. Widen sidewalks on 1 st Street. Entry signage in the median could identify the historic neighborhood. A Historic Broomfield logo could be developed. Entry medians are okay if that is what the neighborhood desires.
Enforcement is needed in the areas where people tend to speed.
No traffic circles. 4-way STOP at 2 nd and Beryl. Test edge and centerline striping to see if it makes a difference. Then it can be added to other streets in the neighborhood. Rumble strips are noisy.