What Is Traffic Calming?
Traffic calming refers to a set of physical and design interventions used to slow vehicle speeds, reduce cut-through traffic, and make streets safer for pedestrians and cyclists. Unlike enforcement-based approaches (such as speed cameras or police patrols), traffic calming works passively — it changes driver behavior through the built environment itself.
These measures are especially important on residential streets, near schools, and in pedestrian-heavy commercial areas where the risks of speeding vehicles are highest.
Common Traffic Calming Measures
Speed Bumps and Speed Humps
These are the most recognizable traffic calming tools. Speed bumps are sharp, narrow, and typically found in parking lots — they require near-complete stops. Speed humps are longer and gentler, designed for streets where vehicles should slow to 15–20 mph without fully stopping. Speed tables (flat-topped humps) are a variation often used at crosswalks.
Chicanes and Curb Extensions
Chicanes are alternating curb extensions or planted medians that force drivers to weave slightly, naturally reducing speed. They also create space for street trees and greenery. Curb extensions (also called bulb-outs) extend the sidewalk into the parking lane at intersections, shortening the pedestrian crossing distance and improving visibility.
Raised Crosswalks and Intersections
Raising the crosswalk to sidewalk level creates a visual and physical cue that pedestrians have priority. Raised intersections go further, elevating the entire junction. These are highly effective near schools and busy commercial corridors.
Roundabouts
Replacing a traditional intersection with a roundabout forces vehicles to slow and yield. Studies consistently show roundabouts reduce serious injury crashes significantly compared to stop-sign or signal-controlled intersections.
Narrowing Travel Lanes
Wider lanes encourage higher speeds. Restriping lanes to be narrower — or adding bike lanes and sidewalk buffers — can slow traffic without any physical construction.
Comparing Traffic Calming Options
| Measure | Best For | Cost Range | Speed Reduction |
|---|---|---|---|
| Speed Humps | Residential streets | Low | Moderate |
| Curb Extensions | Busy intersections | Medium | Low–Moderate |
| Raised Crosswalks | School zones, high-ped areas | Medium | Moderate |
| Roundabouts | Multi-road intersections | High | High |
| Lane Narrowing | Arterial streets | Low | Low–Moderate |
How to Advocate for Traffic Calming on Your Street
- Document the problem — collect near-miss reports, measure informal speed data, photograph hazardous conditions
- Gather neighbor signatures — a petition with community support carries weight with city engineers
- Contact your city's transportation or public works department — request a traffic study or engineering assessment
- Attend city council meetings — speak during public comment periods and submit formal requests in writing
- Partner with schools or senior centers nearby — institutions have added leverage with local government
The Bigger Picture
Traffic calming isn't just about safety statistics — it's about reclaiming streets as livable public spaces. When vehicles slow down, children play outside more, people walk to local businesses, and neighbors actually talk to each other. The design of our streets shapes the culture of our communities. Advocating for calmer streets is advocating for a better quality of life.