01
Very few children outdoors
Few children playing, biking or waiting for a bus may affect the type of pedestrian exposure. Still check for visitors, other vulnerable users and measured vehicle speeds.
SMORTLER + SI / Violet's neighborhood trade-off lab
When slowing down
When slowing down
needs a second look.
Speed humps can improve a street with real speeding problems. But what if traffic is already calm, the gate does the work, or a new hump adds noise outside somebody's front window? Violet explores when less can be more.
The key distinction: This is not an argument against safer streets. It is an argument for measuring the problem and selecting the right response. A residential speed hump can reduce speeds. It may also bring noise, extra braking, emergency access concerns or inconvenience - and none of those effects automatically tells us a home's future sale price.
When the safety case is strong
Documented speeding, people walking or cycling, and an identifiable risk can support a professionally designed traffic-calming review.
When the case is less clear
Low measured speeds, very light traffic, a controlled gate or another working measure may make another hump redundant or poorly suited to the street.
the six quiet-street clues / adapted from Kevin's original article
Six reasons to ask, "Do we actually need another hump?"
The original SMORTLER guide called out extremely quiet neighborhoods with almost no everyday street activity. Those details can matter - but absence of one type of activity is not proof that a street is safe or that speeding never happens.
02
Little pet-related activity
Few animals near the street may be one local consideration, not a guarantee that other street users are protected.
03
Almost no walking or cycling
A loop with little foot traffic has different exposure from a popular walking route. Consider future use and access needs, too.
04
Very few deliveries or visitors
Less service traffic may reduce conflicts, but delivery trucks are not the only reason speeding becomes a problem.
05
No cut-through traffic
A self-contained cul-de-sac may experience fewer unfamiliar drivers. Verify actual speeds before assuming a hump is essential - or unnecessary.
06
No school-bus stop or pickup queue
Without a school-related activity hotspot, one common reason for targeted calming may be absent. Other documented hazards can still justify intervention.
gates, short loops and other natural slow points
Sometimes the neighborhood is already doing the slowing.
A guardhouse, keypad gate, sharply curved street, short loop, narrow lane or frequent intersection can lower speeds without another vertical obstruction. But a gate does not prove that drivers remain slow once inside - that takes observation.
1
Gated entrance
Drivers slow or stop to enter; study what happens after the gate.
2
Short residential loop
A street without long straightaways may already discourage high speeds.
3
Existing calming
Stop controls, medians, lane geometry or speed feedback may already address the actual concern.
4
Nearby homes
A hump near bedrooms or driveways may introduce braking, acceleration and noise concerns for those residents.
Violet's interactive neighborhood trade-off lab
Is a speed hump the right answer for this street?
Choose a scenario or describe your own street. Violet will suggest questions to investigate, not an installation design, crash-risk score or property-value estimate.
Step 1 - Describe the neighborhood
Measure the problem before adding a hump
A quiet gated loop with no documented speeding may not benefit much from another physical obstacle.
Step 2 - See the treatment in context
Residential speed hump shown as a conceptual marker, not an approved geometric design.
Speeding: unconfirmedReview: regular accessResale impact: not estimated
A speed hump and a speed cushion are different devices. This illustration does not specify height, width, placement, signage, grading or drainage design.
traffic calming evidence / trade-offs, not predictions
Slower traffic can help. Other effects still matter.
Measured speed reduction
FHWA reports meaningful reductions in excessive speeding at studied hump sites. This supports using them where the street actually needs speed control, not automatically everywhere.
Source: FHWA Traffic Calming ePrimer, Modules 3 and 4.
Emergency, service and noise impacts
Roadway humps can slow fire apparatus and ambulances, affect buses and waste vehicles, and create braking, acceleration and other nearby noise. Routes and placement need agency review.
Source: FHWA ePrimer, Modules 2, 3 and 5.
Housing values vary
A Georgia matched-neighborhood study found no consistent statistically significant sales-price effect. A separate 2019 study found negative effects in its sampled neighborhoods. Neither result predicts a particular house's value.
Sources: TRID / ITE Journal and Graham & Jones (2019).
Important: A home can be more comfortable on a calmer street without its sale price necessarily changing. Likewise, documented noise or inconvenience does not guarantee a decrease. Local comparable sales and a qualified appraisal are needed for valuation conclusions.
the counterpoint - choose treatments that fit the street
Other ways to improve safety without assuming humps
This is a discussion matrix, not a recommendation to install any particular device. Actual roadway design belongs to the local street authority and its traffic engineering team.
the SMORTLER delivery-driver epiphany / a little humor
The french fries remember the hump.
In Kevin's original story, an overenthusiastic first-time food delivery driver arrives with a tower of takeout and apparently believes the neighborhood entrance is a racetrack starting line.
One surprise hump later, the fries have scattered, the drinks have rebelled, and the driver has received a memorable lesson in respecting residential streets.
The goal isn't to teach a driver to fly. The goal is to make the road predictable before anyone reaches the hump.
It's fictional humor with a useful point: traffic calming should be clearly visible, signed where required, appropriately designed, and placed where it addresses a genuine risk. A surprise jolt beside someone's home is not the objective.
printable community worksheet
Eight questions before saying yes - or no
Whether your neighborhood supports or opposes a new hump, the fair approach is to gather evidence and consider everyone who uses the street. Checklist progress stays on this browser only.
0 of 8 planning checks complete.
Violet's final questions
Common questions about a quiet street
Does having no children outside mean speed humps are unnecessary?
No. Child activity is one type of exposure, not a complete safety test. Actual speeds, road geometry, visitors, older pedestrians and other risks still matter.
Will speed humps definitely lower property values?
No. Studies report neutral and negative findings in specific samples, not a universal effect. A local appraisal and comparable sales would be necessary to study values on a particular street.
Do gates make all additional traffic calming redundant?
Not necessarily. Gates slow entry, but some drivers may accelerate afterward. Check actual street speeds and use before choosing a treatment.
Can a speed hump delay an ambulance or fire truck?
Yes. FHWA identifies delay concerns for certain vertical devices. Emergency service agencies and the local traffic engineer should be involved before a treatment is approved.
What is the difference between a hump and a parking-lot bump?
A roadway speed hump is a longer, more gradual traffic-calming device. A short, abrupt parking-lot-style bump is not interchangeable with an engineered residential road hump.
What if speeding is a real concern despite a quiet neighborhood?
A neighborhood with quiet-looking streets may still have a measurable speeding problem. Collect evidence and consider suitable traffic calming with the local road authority. Violet's companion guide covers the positive case.
Finish the two-part series: This page explains when speed humps may be a poor fit. For the case in favor of measured, professionally designed traffic calming, open Violet's Neighborhood Traffic Lab - When Speed Humps Can Help.
Educational discussion only. This is not traffic-engineering, legal, real-estate or investment advice. No property-value outcome is promised. Street treatments require the appropriate local authority's review and approval.