Warrant Analysis Data

It is common to first analyze warrants requiring data that is easier to collect. If a signal does not meet any of these warrants, then the more difficult data is collected and the other warrants are analyzed. The following table shows the suggested phased data collection and associated warrants.
Suggested Phased Data Collection and Associated Warrants
Phase
Warrants
Phase 1 — Volume Warrants
  • Warrant 1: Eight Hour Vehicular Volume
  • Warrant 2: Four Hour
  • Warrant 3: Peak Hour
Phase 2 — Crash Warrant
  • Warrant 7: Crash Experience
Phase 3 — Signal Operation Warrants
  • Warrant 6: Coordinated Signal System
  • Warrant 8: Roadway Network
Phase 4 — Railroad Warrants
  • Warrant 9: Intersection Near a Grade Crossing
Phase 5 — Pedestrian Warrants
  • Warrant 4: Pedestrian Volume
  • Warrant 5: School Crossing.
In addition to meeting the minimum criteria for one or more of these warrants, an engineering study must also indicate that installing a traffic signal would improve the safety and/or operation of the intersection without disrupting the progressive flow of traffic. Simply meeting a warrant does not necessitate the installation of a traffic signal.