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Traffic Studies

Traffic studies are an important part of the Traffic Section's work program. Studies are performed in response to citizen and staff requests. Studies include Speed Studies, Curve Studies, Sight Distance Studies, and Warrant Studies.

Each type of study concentrates on a particular traffic concern as described below:

  • Speed Studies look at speed limit postings along a section of roadway. These studies look at traffic speeds, pavement condition, surrounding land use, roadside traffic and parking, sight distance, and accident histories.
  • Curve Studies look at both horizontal and vertical (hills, dips) curves to determine the sight distance available according to criteria established by AASHTO (American Association of State Highway and Transportation Officials). The sight distance is used to help establish a reasonable speed limit for the curve.
  • Sight Distance Studies look at sight distance criteria to identify locations where a driver is unable to see far enough to enter or cross the roadway. These studies are often performed at intersections or intersection approaches and help identify locations where landscaping, signs, etc. block the driver's view. Obstructions may be removed or relocated to a different location or additional signing may be recommended to help in those locations where the obstruction cannot be moved.
  • Warrant Studies look at locations where multi-way stop signs or traffic signals may be warranted. The warrant studies look at criteria set up in the MUTCD (Manual on Uniform Traffic Control Devices). The MUTCD is the legal controlling document for these installations in unincorporated Larimer County.

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