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4. REKABENTUK PERSIMPANGAN Takrif persimpangan: kawasan di mana dua/lebih daripada lebuhraya menyilang / memintas. Pemandu menyeberangi arus lalulintas, beralih arus dan menukar arah pergerakan. Utamakan keselamatan, kurang kelemahan. Searas- dongakan yang sama. Panduan: Arahan Teknik Jalan 11/87: A guide to the design of at-grade intersections Arahan Teknik Jalan 13/87: A guide to the design of traffic signals Faktor mempengaruhi muatan persimpangan: rekabentuk geometri dan kawalan lalulintas: jumlah / lebar lorong, r/b penyaluran, jejari memusing dll. Jenis-jenis persimpangan dan lakaran: simpang tiga (Y/T), empat (tepat / ofset / serong) , pelbagai cabang a. persimpangan tanpa tandaan/kawalan b. persimpangan keutamaan c. persimpangan dengan penyaluran d. bulatan dengan lampu isyarat atau tanpa lampu isyarat e. persimpangan kawalan lampu isyarat f. persimpangan bertingkat Jenis pergerakan di persimpangan: memusing, menyilang, mencantum, mencapah, menjalin (melintas seketika tidak

C 4302 Highway and Transportation Engineering Assignment 2 1. Highways are designed to meet the requirement of vehicle, driver and traffic. What important aspects of human behavior must be considered in the geometric design og highways? (15 m) 2. Discuss the important of a transition curve in the horizontal alignment from the viewpoint of driver comfort , superelevation requirements and pavement widening at corners. (15 m) 3. Traffic island are widely used in junction design to promote junction traffic safety. With the aid of sketches , illustrate some examples on use of traffic islands to promote traffic safety at Tee-junctions. (20 m)