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Unformatted text preview: Delay Estimation Program
The construction zone described in section 184.108.40.206.1 (page 52) was input to the program. In QuickZone, the layout of the road section to be simulated is entered to the
system using nodes and links.
In QuickZone nodes are defined as the beginning and end points of a road section.
In the simulation of the I-76 Westbound Work Zone, the road is considered to be
composed of 3 nodes. The nodes used in the QuickZone are given in Figure 24. The X
and Y values are positions in the coordinate system of each node, given in feet. The X
and Y values are derived from the drawing in Figure 13. Traffic flow is in the negative
direction, from X=3000 to X=0. Node Information
1.00 Figure 24: Node Information (X-Horizontal Axis, Y-Vertical Axis) Links in QuickZone define the road sections. A link joins two nodes. The eight
links defined in the I-76 westbound work zone simulation are given in Figure 25. Links
also have traffic parameters associated with them. 93 Link #
2 A Node
2 B Node
2 Capacity (VPL)
2100 Length (Miles) Freeflow Speed (mph) Jam Density (V/mi/L)
220 I or O
0 Figure 25: Link Information An A node is the beginning point of a link and a B Node is the end point of a link.
Thus link 1 connects Node 1 (A Node) to Node 2 (B Node). In the lanes column, number
of lanes in the road section is given. Capacity is entered as the number of vehicles per
hour per lane (vphpl) and the length of a link road section is given in miles. Jam density,
which is the number of standing vehicles that will fit on one lane mile of the road, is also
specified. The column headed I or O indicates whether the direction of the link is
Inbound or Outbound . All links in the model are inbound. Links are defined as one
of six types in QuickZone: Mainline (M), Work zone (WZ), Detour 1 (D1), Detour 2
(D2), Ramp (R) and blank (for links that are none of the other five types). The types of
links used in the simulation are entered as the mainline (M) or work zone (WZ). The
Position attribute is used for generating a visual representation of the network.
The second input of the QuickZone is the inbound demand pattern. Hourly
percentages according to the daily traffic counts are entered into the inbound demand
pattern in QuickZone. To calculate these numbers, hourly traffic counts for 08/20/04
Friday were used, the same day as it was used in ARENA simulation model. By dividing
each hourly traffic count by the total daily count the percentages for hourly demand
patterns were obtained. The traffic counts and calculations of the hourly percentages are 94
given in Table 24. These percentage values are entered as the hourly demand factors into
QuickZone, same demand factors were used for all days of the week Figure 26. Table 24: Hourly Vehicle Counts and Hourly Demand Factors for 08/20/2004 Time Number of
Vehicles per Hour 0:00
18827 Hourly Demand Factors
(Number of Vehicles per hour /
Number of Vehicles per Day)
Temporal Distribution of In-Bound Demand 8.0% 7.0% Percent of link ADT 6.0% 5.0% 4.0% 3.0% 2.0% 1.0% 0.0%
0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 Time of Day 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 Figure 26: Temporal Distribution of Hourly Inbound Demand on I-76 Westbound
based on the Hourly Vehicle Count Data for both Lanes Collected on 08/20/04 QuickZone relies on hourly demand data to conduct its calculations. The demand
module is used to generate hourly counts on a link-by- link basis for each day of the week.
In the demand module, the daily traffic count for Sunday is entered for all of the links
Figure 27. Since there are no entrances or exits within the work zone, all links have the
same amount of traffic. In addition the truck percentages data for the day was entered,
the daily truck percentage was 27%, and it was assumed to be same for all day. The
ehicle counts for all the days of the week and the truck percentages during the
day were assumed to be the same in order to be able to compare the results of the
simulation with the developed ARENA simulation model. 96
2 I or O
18827 Figure 27: Daily Traffic Counts for the Links Link travel demand volumes may be adjusted by phase based upon the seasonal
demand pattern for each month in the year in QuickZone. The seasonal demand pattern is
specified as 100% for all of the months, since the simulation project duration was one
week during August so values for other months were not used.
In the project information modu...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.
- Spring '13