Download - Vehicle Delay Study
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Vehicle Delay Study
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Before anything else Read the manual carefully. It is
your homework What is covered in the following
slides is just general
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General Determines LOS of lane
group/approach Measured by seconds delayed for
eachvehicle! Simplification of Highway Capacity
Manual HCM
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Collect the data Choose intersection
Signalized intersections Choose time of day
Usually peak hour Choose the approach
You may need to zoom in further to a specific lane group
Exclusive left turn is studied by itself
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Collect the data For illustrations let us study delay
of an exclusive left turn lane
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Collect the data First observer counts and records
the number of vehicles stopped on the left lane for each 15 seconds interval
A vehicle is counted more than once in the delay determination if it is stopped during more than one sampling time.
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Collect the data The second observer performs a
separate tabulation of the lane volume for one minute intervals by classifying the vehicles as either stopped or not stopping.
At least 350 cars must be counted
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Numbers in that column can’t be true!
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Data Analysis Two calculations are needed
General calculations For sake of LOS determination
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Data Analysis General
calculations
ondssec9.9233
2310233
15541eper vehicl delayed seconds
delayed vehiclesof volumeTotal15intervalsdelay in vehiclesofNumber eper vehicl delayed seconds
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Data Analysis General
calculations
%57409233delayed volume totalof %
100counted vehiclesof volumeTotal
delayed vehiclesof volumeTotaldelayed volume totalof %
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Data Analysis For sake of LOS determination
Correction factors: acceleration deceleration Vehicles processed in less that 15 sec
All of that is accounted and used in the simplified way:
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Data Analysis For sake of LOS determination
ondssec3.73.140923103.1
40915541eper vehicl delayed seconds
3.1counted vehiclesof volumeTotal
15intervalsdelay in vehiclesofNumber eper vehicl delayed seconds
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LOS Compare that number to the
following table
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Calculations repeat this analysis for the other
approaches of the intersection Prepare a graphical representation
for the delay and LOS of each lane group
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Interpret and conclude Answer questions in manual Prepare your presentation