Speed Management and Safe Crossing on Dhaka-Sylhet Highway (N2) in Bangladesh

the record keepers prior to
crash recording. Data
is being collected <strong>and</strong>
entered to the computer on
monthly basis.
3.2.2 DOCTOR
observation
Field observation had been
done on the spots by two
trained human observers,
backed-up by unobtrusive
video recording. The total
observation per black spot
were at least 18 hours,
divided into 6 blocks of 3
hours. This is a st<strong>and</strong>ard
Figure 3.4 : DOCTOR training
period for DOCTOR. The 6
blocks included 3 blocks with busy traffic <strong>and</strong> many interactions with VRUs, <strong>and</strong> 3 blocks with
limited traffic <strong>and</strong> relatively few interactions with VRUs. The video recording a total of 9 days
(day + night). This helped to also analyze periods <strong>and</strong> events that had not been captured by
human observers. For all measuring periods, Representative traffic counts has been conducted
to analyze the data from the recorded video.
3.2.3 <strong>Speed</strong> measurement
The speed distribution of each
type of motorized traffic was
being measured (buses, trucks,
cars, minivans, motorcycles),
when they entered the
‘crossing conflict zone’, i.e.,
where most pedestrians <strong>and</strong>
other vulnerable road users
cross. Only the speed of freeriding
<strong>and</strong> passing traffic
was measured. For each
type of motorized traffic
at least 200 objects were
recorded. As measurement
tools, a laser gun, backed-up
by speed measurements from
video was used.
Figure 3.5 : Snap of traf fic analysis video
Report on <strong>Speed</strong> <strong>Management</strong> <strong>and</strong> <strong>Safe</strong> <strong>Crossing</strong> on Dhaka-Sylhet Highway (N2) in Bangladesh 21