Disertasi ini bertujuan untuk mengenalpasti kesesuaian kaedah merekabentuk
persimpangan bulatan menggunakan kaedah Arahan Teknik (Jalan) JKR 11/87 dan
membandingkannya dengan kaedah R.M Kimber (TRRL) dan perisian komputer SIDRA 5
(ARRB). Hasil dari itu usul-usul membina dicadangkan bagi meningkatkan atau memajukan
kaedah merekabentuk dan meramal kapasiti persimpangan bulatan di Malaysia. Bagi mencapai
tujuan tersebut , satu persimpangan bulatan telah dipilih untuk dikaji sebagai satu kajian kes
dengan menggunakan tiga (3) kaedah yang berkenaan. Hasil daripada kajian mendapati kaedah
Arahan Teknik adalah kurang sesuai untuk digunakan. Ini kerana kaedah ini memberikan nilai
kapasiti bagi kawasan seksyen jalinan sahaja dan tidak mengambilkira susunatur persimpangan
bulatan keseluruhannya. Selain itu ianya juga berasaskan persamaan yang agak ketinggalan
yang berasal dari United Kingdom dan telah tidak digunakan lagi di sana. HasU dari kajian
juga mendapati setiap kaedah mempunyai pendekatan asas yang berbeza di mana kaedah
Arahan Teknik berasaskan keluasan seksyen jalinan, kaedah Kimber berasaskan kepada
susuatur geometri dan hubungan aliran masuk/memusing lalulintas pada persimpangan
bulatan, dan kaedah SIDRA berasaskan nilai parameter 'gap acceptance' dan corak asalandestinasi
lalulintas. Perbandingan terus antara keputusan kajian bagi setiap kaedah juga tidak
dapat dilakukan akibat daripada pendekatan yang berbeza tersebut. Di akhir kajian telah
mendapati dan mencadangkan bahawa adaptasi sebahagiannya atau secara keseluruhan kaedah
Kimber dan kaedah SIDRA kepada amalan merekabentuk persimpangan di Malaysia adalah
munasabah dan boleh diterimapakai.
___________________________________________________________________________________
The objectives of the tesis were to identify the effectiveness and suitability of the roundabout
design method of Arahan Teknik (Jalan) JKR 11/87, and to compare it with the method of
R.M Kimber (TRRL) and 'SIDRA 5' (ARRB) computer software. Later, recommendations
were developed and proposed to improve the design and capacity prediction method of
roundabout junction in Malaysia. To achieve the objectives, one (1) roundabout junction was
chosen and studied as a study case -with the application of the three (3) methods mentioned.
As a result it was found that the Arahan Teknik's method is unsuitable for design purposes. It
is because it gives the capacity value of the weaving section only and did not take into
consideration the geometric layout of the whole junction. Furthermore, it was based on an
outdated equation that was originated from United Kingdom and was no longer used . From
the study it was also found that each method has it differences in it's basic approache.
Whereby, the Arahan Teknik method was based on weaving section area, R.M Kimber's
based on the junction geometric layout and entry/circulating flow relationship, and SIDRA
method based on the gap acceptance parameter and traffic origin-destination pattern.
Therefore, direct comparison of each method's calculated capacity value cannot be done
because of the differences. At the end of the study it was found and proposed that partly or
fully adaptation of R.M Kimber and SIDRA method to Malaysian roundabout junction design
practice is possible and acceptable.
Kajian kaedah pengiraan kapasiti persimpangan bulatan Ahmad Roslee Bin Hamzah_A9_1997_NI