Speed Management and Safe Crossing on Dhaka-Sylhet Highway (N2) in Bangladesh
Speed-Management-and-Safe-Crossing-An-Experience-in-Dhaka-Sylhet-Highway-N2-in-Bangladesh
Speed-Management-and-Safe-Crossing-An-Experience-in-Dhaka-Sylhet-Highway-N2-in-Bangladesh
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Compar<strong>in</strong>g the average numbers per m<strong>on</strong>th for the before <str<strong>on</strong>g>and</str<strong>on</strong>g> after period. The table<br />
shows an average reducti<strong>on</strong> <strong>in</strong> the number of crashes of 66%, <strong>in</strong> the number of people killed<br />
of 67% <str<strong>on</strong>g>and</str<strong>on</strong>g> <strong>in</strong> the number of <strong>in</strong>juries of 73%. For pedestrians, comparis<strong>on</strong> between before<br />
<str<strong>on</strong>g>and</str<strong>on</strong>g> after period reveals a reducti<strong>on</strong> <strong>in</strong> the average number of crashes of 65% while the<br />
average number of pedestrian <strong>in</strong>juries decl<strong>in</strong>ed by 81%.<br />
6.3 C<strong>on</strong>flict observati<strong>on</strong> (DOCTOR) us<strong>in</strong>g video record<strong>in</strong>gs<br />
Dur<strong>in</strong>g the project, <strong>on</strong>e of the major comp<strong>on</strong>ents was analys<strong>in</strong>g the c<strong>on</strong>flicts (near crash)<br />
through DOCTOR (Dutch objective of c<strong>on</strong>flict technique observati<strong>on</strong> <str<strong>on</strong>g>and</str<strong>on</strong>g> research) techniques.<br />
For analys<strong>in</strong>g the traffic behaviour, the DOCTOR method requires a total c<strong>on</strong>flict observati<strong>on</strong><br />
period of 18 hours. For the sampl<strong>in</strong>g of the record<strong>in</strong>g for each locati<strong>on</strong>, 3 days with specific time<br />
block (4.5 hours each <strong>in</strong> Before-After per locati<strong>on</strong>) were selected to analyse the data. As we<br />
analysed these videos it became clear that slight c<strong>on</strong>flicts accord<strong>in</strong>g to the DOCTOR technique<br />
(severity category 1-2) are c<strong>on</strong>sidered as more or less normal behaviour <strong>in</strong> the <strong>Bangladesh</strong><br />
sett<strong>in</strong>g compar<strong>in</strong>g with developed world. Therefore, we decided to focus our analysis <strong>on</strong> the<br />
severe c<strong>on</strong>flicts (severity category 3-5) <strong>on</strong>ly.<br />
In Nilkuthi, 4.5h period analyses revealed that the number of serious c<strong>on</strong>flicts was reduced<br />
from 56 <strong>in</strong> the before period to 38 <strong>in</strong> the after period (Figure 6.4). In additi<strong>on</strong>, this also<br />
<strong>in</strong>dicates a shift to the left <strong>in</strong> c<strong>on</strong>flict severity, imply<strong>in</strong>g that the c<strong>on</strong>flicts <strong>in</strong> the after period are<br />
less severe than <strong>in</strong> the before period with no c<strong>on</strong>flicts of the highest level 5 anymore. C<strong>on</strong>flicts<br />
with severity 5 represented 12.5% of serious c<strong>on</strong>flicts <strong>in</strong> the before period.<br />
In Kunderpara the number of serious c<strong>on</strong>flicts was reduced from 73 to 22 <strong>in</strong> the after period<br />
(Figure 6.4), a larger reducti<strong>on</strong> than <strong>in</strong> Nilkuthi. When we take the road user volumes <strong>in</strong>to<br />
account by the number of c<strong>on</strong>flicts/volume, we see a reducti<strong>on</strong> <strong>in</strong> c<strong>on</strong>flict risks of 67%<br />
(22/5.645 After versus 73/5.724 Before).<br />
<br />
Like <strong>in</strong> Nilkuthi, Figure 6.4 shows a shift to the left <strong>in</strong> c<strong>on</strong>flict severity, imply<strong>in</strong>g that the<br />
c<strong>on</strong>flicts <strong>in</strong> the After period are less severe than <strong>in</strong> the Before period with no c<strong>on</strong>flicts <strong>in</strong> the<br />
most severe category anymore. This effect <strong>in</strong> Kunderpara was also str<strong>on</strong>ger than <strong>in</strong> Nilkuthi.<br />
Severity of c<strong>on</strong>flict<br />
Figure 6.4: Nilkuthi <str<strong>on</strong>g>and</str<strong>on</strong>g> Kunderpara total number of serious c<strong>on</strong>flicts before-after<br />
(per severity)<br />
Report <strong>on</strong> <str<strong>on</strong>g>Speed</str<strong>on</strong>g> <str<strong>on</strong>g>Management</str<strong>on</strong>g> <str<strong>on</strong>g>and</str<strong>on</strong>g> <str<strong>on</strong>g>Safe</str<strong>on</strong>g> <str<strong>on</strong>g>Cross<strong>in</strong>g</str<strong>on</strong>g> <strong>on</strong> <strong>Dhaka</strong>-<strong>Sylhet</strong> <strong>Highway</strong> (<strong>N2</strong>) <strong>in</strong> <strong>Bangladesh</strong> 40