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Default (Standard Local Street)

LOC-DEF-01
Recommended Local

Default (Standard Local Street)

The baseline Local street. No special access pattern, event use, or dedicated mode gives it a name of its own, so it carries the base Local modal hierarchy and speed rule unmodified. Every other Local Typology is defined as a departure from this one: a Typology earns its own name only when its entire reason for existing is a specific access pattern, a specific event use, or a specific mode.

#Illustration

Type: Paired. Format: Segment / cross-section (~2.8:1).

Typical condition
Oversized suburban local cross-section: no planting buffer, a narrow or absent sidewalk, and an overly wide travel lane.
Commonway recommendation
Sidewalk 5 ft, planting/furnishing zone 5 ft (standard, not optional), shared two-way undivided travel lane 18 ft, sized to self-enforce 20 mph.1

Callouts

  1. (Physical) Sidewalk sized for comfortable two-way pedestrian travel.
  2. (Physical) Planting/furnishing zone buffering pedestrians from the travel lane.
  3. (Physical) Travel lane narrowed to self-enforce 20 mph.2

#Where this pattern applies

Typical at: Suburban Compact Urban Core

Rural is an edge case, not the norm. Farm and rural-residential contexts more often produce a Rural Collector / Farm-to-Market Road pattern instead, since a genuinely Local-scale street needs enough nearby development to serve. Undeveloped contexts are unlikely to carry a Local street at all, for the same reason.

#Speed and modal hierarchy

SPEEDLIMIT20
20 mph hard maximum, no exceptions. This is not a target or an aspirational limit: under CS's self-enforcing roadway principle, design speed always equals posted speed, so the street's geometry itself has to make 20 mph the comfortable driving speed, not just the posted number.1

#Relationship to other Local Typologies

This entry is the reference point, not one option among equals. Reading the other eleven Local Typologies as departures from this baseline makes the whole set easier to hold in mind:

#Where a Local street meets a bigger street

The default intersection treatment where this pattern meets a Collector is a Continuous Sidewalk / Raised Junction: the sidewalk and bike path stay uninterrupted, and the roadway ramps up to meet them rather than the reverse.

#Design notes

This entry is the standard against which every other Local Typology is defined as an override. A Typology only departs from the base modal order when its entire reason for existing is a specific mode.

Continuous Sidewalk / Raised Junction (INT-CSJ-06) (this pattern's own default intersection treatment where it meets a Collector), Default (Standard Collector) (COL-DEF-01) (the equivalent baseline one Functional Classification up)

#References

  1. Legal / regulatory FHWA, "Self-Enforcing Roadways: A Guidance Report," FHWA-HRT-17-098, 2018.(opens in new tab)
  2. Precedent-based National Association of City Transportation Officials, Urban Street Design Guide, "Street Design Principles: Lane Width."(opens in new tab)

Suggest changes to this page (opens in new tab) Text-only version Last updated September 10, 2026