Roadway Configuration: Three Lanes without Raised Median (one lane each way with two-way left-turn lane)

Countermeasure recommendations differ based on the level of traffic and posted speed limit. Click on the link below that represents the Vehicle AADT and Posted Speed Limit at your location to see the countermeasures that address your safety issue.

For three lane configurations without a raised median with

• Vehicle AADT < 9,000
  • Posted Speed Limit <= 30 MPH
  • Posted Speed Limit = 35 MPH
  • Posted Speed Limit = 40-45 MPH
• Vehicle AADT = 9,000 - 15,000
  • Posted Speed Limit <= 30 MPH
  • Posted Speed Limit = 35 MPH
  • Posted Speed Limit = 40-45 MPH
• Vehicle AADT > 15,000
  • Posted Speed Limit <= 30 MPH
  • Posted Speed Limit = 35 MPH
  • Posted Speed Limit = 40-45 MPH

Photo courtesy of FHWA

A Decision Tree is also available to assist you.