Abstract
The purpose of this study is deriving proper plan which is improving functionality of three-way intersection in two-way road by using shoulder. Alternatives of this study were considered as installation of yield lane and application of TWLTLs (Two-Way Left-Turn Lanes). Case studies to utilize alternatives were limited to national and local roadways which is wider than 11 meters due to be required 3 lanes. Under various traffic conditions such as traffic volume of each direction and left-turn, alternatives were analyzed by simulation. As a results, application of TWLTLs was better than installation of yield lane in terms of improving rate (8.0% vs. 3.7%). Application of TWLTLs is supposed to better alternative, however enough driver education is required to improving safety because it is different with existing driving pattern and/or behaviors. Some limitations and future research agenda have also been discussed by on-site inspections.
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