Every field guards its doors with vocabulary, mostly by accident. City transportation is no different — sit in one public meeting and you’ll hear LTS, road diet, and daylighting sail past like everyone was issued a decoder ring at the door. Here’s yours. A dozen terms, each with a plain meaning and a plain rating of what it’s actually worth — because some of these words are concrete and some of them are paint, and a fluent resident knows the difference.
The lanes, from paint to concrete
Bike lane (conventional). A painted stripe and a bike symbol. The take: better than nothing, and nothing more — fine where traffic is calm, a suggestion in a uniform where it’s fast.
Buffered bike lane. The stripe plus a hatched buffer of extra space. The take: meaningfully comfier than a plain stripe, still ultimately paint. The polite middle child.
Protected bike lane (also separated or cycle track). Something physical between you and traffic — posts, curbs, planters, or parked cars. The take: this is the thing. It’s what makes riding feel normal for children and seniors. When people say a city “got serious,” they mean this.
Sharrow (shared-lane marking). A bike-and-chevrons stencil in a regular travel lane. The take: a reminder that bikes may exist, which was already true. If a project’s bike component is sharrows, the plain translation is “we’ll get to it later” — worth saying at the mic, without blame.
Neighborhood greenway (or bicycle boulevard). A quiet residential street tuned for riding — calming, safe crossings, sometimes filters that pass bikes but not cut-through cars. The take: the best value in the catalog, and politically gentle, because it makes the street lovelier to live on too.
The street-shape words
Road diet. Reorganizing a street’s lanes (classically four narrow ones into two plus a turn lane) to free space for bike lanes or wider sidewalks. The take: one of the best-studied safety treatments in US practice, and it usually keeps traffic moving fine. Expect controversy anyway; be the calm voice with the facts.
Traffic calming. The umbrella for physical speed-reducers: humps, raised crossings, chicanes, narrowed lanes. The take: it works because it changes what the street suggests, and people drive the design, not the signs.
Daylighting. Clearing the parking spaces nearest a corner so everyone can see everyone. The take: absurdly cheap, provably sensible, the single most winnable ask on this page. If you memorize one word, take this one.
Protected intersection. Corner islands and setback crossings that keep riders separated through the turn, where most serious conflicts happen. The take: the gold standard, arriving slowly in the US. Ask for it by name so your city knows residents know it exists.
Curb extension (or bulb-out). The sidewalk bulging into the parking lane at a crossing, shortening the walk across and slowing turns. The take: mostly a walking treatment, but it calms the whole street, and calm streets are shared wins.
The planner’s yardsticks
Level of Traffic Stress (LTS). A 1-to-4 rating of how nerve-racking a street is to ride: LTS 1 is comfortable for children, LTS 4 for approximately no one. The take: the most useful concept in the field, because it measures the network by its weakest link. One scary block makes the whole route scary, and an LTS map is your city admitting which blocks.
Ages 8 to 80 (or all ages and abilities). Design language for streets that work for a third-grader and a grandparent, not just the confident and quick. The take: when this phrase is in your city’s plan, it’s a standard you can quote back forever. Check whether it’s in yours.
Modal filter. A gate, bollard, or planter that lets bikes and walkers through but not through-traffic. The take: beloved wherever it exists, feared wherever it’s proposed. Suggest it for the street everyone already complains about cut-through drivers using.
Next time something on your street bugs you, tap the picker above, get the term, and put it in a two-sentence email to your council member — or take it to the podium. You’re fluent now. Spend it.