Mto traffic model
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MTO TRAFFIC MODEL

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Mto traffic model

MTO TRAFFIC MODEL

The following presentation contains references to Figures 6.02 and 6.03, Tables 6.01 and 6.04, all of which are posted under subsection 2.6 of the course notes on the instructor’s website. Viewer discretion is advised as some scenes contain material of a graphic, tabular and mathematical nature and are intended for mature audiences.


Mto traffic model1

MTO TRAFFIC MODEL

What does it do?

Enables you to estimate the number of passes of a standard unit (ESAL) over a pavement during a specific design period.

What information do you need?

Analysis Period, Ap

AADT in first year of Ap

Annual Percent Traffic Growth Rate

Number of Traffic Lanes & Directions

Percent Trucks in Initial & Final Year of Ap


Total esal s n f over analysis period

Total ESAL’s, Nf Over Analysis Period

Final ESAL’s/day

ESAL’s/day

Average ESAL’s/day or DTN

The MTO uses a trapezoidal representation of the total accumulated ESAL’s over the analysis period

Nf is the area of the trapezoid = number of days in Ap x DTN

Initial ESAL’s/day

Time

Analysis Period, Ap

Initial Year

Middle Year

Final Year


Accumulated esal s n

Accumulated ESAL’s, N

The MTO uses a parabolic model to determine the accumulated ESAL’s after Y years of the analysis period


The equations

The Equations

Factor days out of equation 2


Example

EXAMPLE

The initial AADT for a 4-lane road is 12500 vpd and is expected to grow over the next 20 years at the rate of 3.5%/year. If the percent trucks is expected to increase from 10% initially to 15% at the end of the analysis period. Find the accumulated ESAL’s after 12years of traffic.


Ok now pull out your copy of table 6 04

0.97

0.77

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OK, now pull out your copy of Table 6.04

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Bring it on home

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Bring it on home!

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