Abstract
Protected-permissive left turn (PPLT) phasing has been popular and widely used in many urban intersections in North America because of its operational benefits. A significant number of intersections have recently been upgraded with four-section signal heads with flashing yellow arrow (FYA) indication for an effective protected-permissive left turn operation. The present study seeks to find appropriate length of two red intervals whose roles are important, but different during the transition period of FYA-PPLT phasing. One is a red interval for delayed-start of permissive left turn movements; the other is additional red interval for delayed-start of opposing through movements. Micro-traffic simulation and conflict analysis are explored to assess the effects of the red intervals on intersection efficiency and safety. A useful reference, which describes the balanced length of the two red intervals under varying traffic levels, is developed as a result.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 732-741 |
| Number of pages | 10 |
| Journal | Canadian Journal of Civil Engineering |
| Volume | 46 |
| Issue number | 8 |
| DOIs | |
| State | Published - 2019 |
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- General Environmental Science
Keywords
- Conflict analysis
- Flashing yellow arrow
- Micro-traffic simulation
- Protected-permissive left turn
- Red interval
- SSAM
- Transition period
- VISSIM