# NYSDOT Heavy Vehicle Percentages 2011.rtf by fjzhangweiyun

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Example of Obtaining the Heavy Vehicle Percentage and Estimating Heavy Vehicle
Volumes

Note: Information in each step is obtained from either the example on page 44 of the 2011 Traffic Data Report or
the attached Heavy Vehicle Percentages table.

Step A – List information from the Traffic Count Hourly Report.

Count Station               Route                Func. Class            Count Type                AADT
920023                    NY 12                    02                  Axle Pairs               2746

Step B – Determine the NYSDOT Region where the station is located.

The NYSDOT Region can be determined from the Count Station. The Count Station is a six digit number consisting
of a two digit Regional/County code followed by a four digit Station ID. In the example, Station 920023 has a
Region/County code of 92 and a Station ID of 0023. Regions 1 through 9 have Count Stations where the first
number is the NYSDOT Region. Regions 10 and 11 have Count Stations that start with zeros. Region 10 will have
Region/County codes 03 and 07. All other Region/County codes starting with zero are in Region 11 (see Appendix
D of the 2011 Traffic Data Report).

Count Station              Region
920023                     9

Step C – Obtain the Heavy Vehicle % from the attached 2011 Heavy Vehicle Percentages table using the Region
and Functional Class.

Region            Functional Class        Heavy Vehicle %
9                      02                   13.7%

Step D – Calculate the estimated volume of Heavy Vehicles at the Station. Multiply the Heavy Vehicle percentage

Estimated Heavy Vehicle Volume = AADT × (Heavy Vehicle % ÷ 100)

= 2746 × (13.7 ÷ 100)

= 376

Heavy Vehicles are defined as all vehicles Class 4 through 13 of the FHWA Vehicle Classifications (page 35 of the
2011 Traffic Data Report). Heavy Vehicle Percentages have been calculated using classification counts completed
over the last six collection seasons (2006 – 2011). The number of counts used in the calculation of each Heavy
Vehicle Percentage is listed in parenthesis.
HEAVY VEHICLE (F04 - F13) PERCENTAGES 2011
BASED ON 2006 - 2011 VEHICLE CLASSIFICATION DATA
Percent and (Number of Counts)

Func.
Class                                                                                         Region
1              2               3               4              5             6               7             8             9             10             11             Statewide
Rural
01      23.7%           23.7%          18.9% (16)      21.1% (10)      23.1% (26)    30.9% (16)   26.6% (34)       23.7%         22.7% (24)                                      23.7% (134)
02      11.2% (26)      12.2% (19)     10.4% (40)      11.8% (42)       9.9% (41)    17.2% (14)   13.4% (76)        6.9% (36)    13.7% (46)                                      11.7% (340)
06       9.4% (73)       8.3% (70)     10.3% (32)       8.1% (67)      11.2% (28)    12.5% (42)       9.7% (80)     8.4% (25)     9.7% (36)    9.5%                               9.5% (453)
07       9.7% (67)       7.2% (124)      7.9% (79)      8.6% (58)       8.8% (158)   10.8% (86)   10.5% (88)        7.8% (39)     8.6% (129)   8.8%                               8.8% (828)
08       7.1% (24)       7.1% (201)      7.9%           6.6% (42)       8.5% (134)   13.7% (24)       8.3% (254)    6.9% (35)     7.8% (222)                                      7.9% (942)
09       5.8% (12)       7.0% (319)      7.2%           8.5% (20)       7.7% (79)     7.2%            7.5% (265)    6.9% (39)     6.7% (134)   7.2%                               7.2% (873)

Urban
11       8.9% (18)      13.2%          13.2%           13.2%           15.7% (20)    13.2%        13.2%            16.8% (22)    13.2%         13.2%         10.4% (57)          13.2% (150)
12       4.4% (11)       7.3% (35)       6.1% (22)      4.3% (56)       5.4% (64)     5.7%                          3.8% (11)     7.3% (20)    5.7%           5.0% (11)           5.7% (239)
14       6.5% (85)       6.1% (74)       6.3% (23)      5.6% (113)      5.8% (191)    6.4% (15)       6.6% (67)     5.3% (79)     6.6% (30)    5.7% (61)      7.3% (234)          6.3% (972)
16       6.3% (126)      4.9% (149)      5.1% (104)     4.2% (192)      4.8% (542)    5.9% (72)       6.5% (65)     4.6% (234)    5.8% (101)   4.0% (90)      5.0%                5.0% (1683)
17       5.9% (186)      4.5% (297)      4.1% (87)      4.5% (178)      4.6% (381)    5.5% (69)       6.4% (47)     4.6% (314)    5.3% (75)    4.1% (102)     7.7% (14)           4.8% (1750)
19       5.2%            5.0% (76)       5.2%           3.1% (12)       5.2% (99)     5.2%            5.9% (12)     5.8% (47)     5.2%         5.2%           5.2%                5.2% (270)

Blank Cell indicates there are no highway segments in this FC in this Region
Shaded Cell indicates that the statewide average for this FC was used or insufficient data (<10 class counts between 2006-2011)

Functional Classification (FC) Codes
Rural                                   Urban
01 Principal Arterial - Interstate      11 Principal Arterial - Interstate
02 Principal Arterial - Other           12 Principal Arterial - Expressway
06 Minor Arterial                       14 Principal Arterial - Street
07 Major Collector                      16 Minor Arterial
08 Minor Collector                      17 Collector
09 Local                                19 Local

NYSDOT Highway Data Services Bureau
August 2012

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