| Title | A Framework for Capacity Analysis of Freeway/On-ramp Junctions |
| Dept | IOT |
| Year | 1999 |
| Month | |
| Price | |
| Summary | The traffic operations at the junctions between freeway main lines and on-ramps can have profound impact on the levels of service of freeways. The objectives of this study are: to provide an understanding of the traffic flow characteristics at such freeway and on-ramp junctions to establish a framework for capacity analysis and to identify research needs. The traffic flow characteristics examined in this study include the relationships among average speed, flow rate, and occupancy at a critical point that is 2/3 of the length of the acceleration lane downstream of the merge point spatial variations of flow rate along the length of acceleration lane between-lane variations of speed-flow relationships and lane distributions of small and large vehicles. Between-lane variations in the speed-flow relationships have been found to be substantial. Lane distributions at critical point appear to be affected mainly by the traffic conditions at the merge point. The lack of a comprehensive database, however, makes it impossible to identify lane capacities and to develop a useful lane-distribution model to support capacity analysis. |
| Post date | 1999/11/11 |
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