A ramp control system extends along southbound I-35E in St. Paul, Minnesota from Little Canada Road to Maryland Avenue. This present system is the culmination of a series of developments. In 1969 the Minnesota Highway Department conducted a successful two week experiment with pre-timed ramp control on three ramps. This lead to the activation of permanent pre-timed metering signals at two of the ramps. An extensive evaluation study of these signals showed substanial improvement in freeway traffic flow, with no significant negative impact on the paralled arterial streets. Because of increasing freeway volumes and the lack of flexibility of pre-timed signal the pre-timed signals were revised to include traffic responsive features. At the same time, traffic responsive ramp control signals were installed at three more ramps. A report published in 1974 described the system installation and operation, and present evaluation results which were very favorable. The experimental, pre-timed, and traffic adjusted ramp control systems have all been operated with control equipment developed by the Minnesota Department of Transportation. The purpose of this report is to present updated information on the operational experience with the I-35E ramp control system, so that accomplishments and limitations may be better understood. /FHWA/

  • Supplemental Notes:
    • Sponsored by the Minnesota Department of Transportation.
  • Corporate Authors:

    Minnesota Department of Transportation

    Traffic Engineering Section
    St Paul, MN  United States  55155
  • Authors:
    • Carlson, G C
    • Lari, A Z
  • Publication Date: 1978-8

Media Info

  • Pagination: 41 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00189352
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-RD-78-T0299, FHWA-MN-TR-78-1
  • Contract Numbers: Mn-TR-78-1
  • Created Date: Apr 12 1979 12:00AM