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MRR 218: Motorcycles Gap Acceptance At Merging Point Of Egress And Ingress Of Exclusive Motorcycle Lane In Malaysia

Motorcycle  accidents  contribute  up to 60% of the traffic fatalities  in Malaysia.  To increase motorcycle  safety, exclusive motorcycle  lanes (EMCL) has been built with the aim to segregate them from other vehicles. Egress (path of exiting) and ingress (path of entering) is one of the hazardous locations on EMCL where motorcyclists are required  to make a critical decision whether to join or leave a traffic stream. One of the important  factor they will need to consider is the availability  of a gap between two vehicles that, in the motorcyclist’s judgement, is adequate for them to merge  into  the  traffic  stream.  Poor  gap  acceptance  decisions  will  increase  the likelihood of crash to happen. Therefore, the purpose of this study is to determine gap acceptance value for motorcyclists at the merging point of egress and ingress of EMCL.  
Focusing on the merging point of egress and ingress where the geometrical design is different   from   the   intersections,    field   data   collection   involved   mainly   the videotaping of rejected gaps and accepted gaps of single motorcycles in the minor stream with the oncoming vehicle types on the major stream. The study started in July 2014 and ended in March 2016. Data collection was conducted in August and September  2015.  The study  was conducted  at six (6) egress  locations  and six (6) ingress  locations  along  the  main  arterial  road;  Federal  Road  2  and  Shah  Alam Highway (KESAS). Three (3) main types of data collected for the study are; gap acceptance  time,  classified  vehicle  speed  and  classified  vehicle  volume.  These findings can be drawn from this study:
  1. Motorcyclists  accept  minimum  gaps  time  of  zero  (0)  seconds  at  egress location due to the availability of sufficient lateral clearance between edge line and vehicle on the intended lane;
  2. The percentage of rejection gap time for motorcyclists was low (3.46%);
  3. Most motorcyclists accept gap time smaller than 2.50 seconds (54.9%);
  4. Gap  acceptance  was  unique  at  each  location  and  not  correlated  with  the design type;
  5. Motorcyclist accept smaller gap time during peak period as compared to off- peak period;  
  6. Vehicle  types  on  the  mainstream  impacted  the  probability  of  accepting  or rejecting  the  available  gaps  where  motorcycles  merging  from  the  minor streams were found to reject smaller gaps when the oncoming vehicle on the major stream were also motorcycles; and
  7. Significant  of  speed  reduction  at  merging  area  of  egress  and  ingress  can  be observed on both EMCL and main carriageway at most locations.
It is suggested that the design of egress and ingress should consider the provision of taper lane or auxiliary lane so that entering or exiting motorcycles  have sufficient time  to  complete  proper  merging  behaviour  as  well  as  adjusting  their  speed difference to the major stream.

MRR 218: Motorcycles Gap Acceptance at Merging Point of Egress and Ingress of Exclusive Motorcycle Lane in Malaysia
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