Make alley at the Garden Center one way. Loading access is needed for UPS trucks, etc. Add a STOP sign at unsigned corner of West Elmhurst and Garnet. Five or six beacons would be needed to be effective. Emerald Street is too wide to ensure pedestrian safety.
Traffic guards are wonderful.
Crosswalks do not really help - flashing beacons are the key. US 287 needs bike and pedestrian improvements. There is only one crossing at Nickel. Elevated crosswalks in Boulder seem to slow people down. They could work at Emerald Elementary School.