HPMS Manual appendix l

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A Guide to Reporting Highway Statistics

HPMS Manual appendix l

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Appendix L HPMS Field Manual

December 2000



APPENDIX L


Metric/English Conversion Procedures



Introduction

The HPMS software is capable of converting HPMS files from English to metric and vice versa when using the import process. The units are set by selecting Admin Tools/Change State/Year. Once the data have been imported into the system, the units cannot be changed. If a State chooses to work in different units, the data must be exported and then reimported after the units are reset.


All data are converted to metric by the HPMS software during the submittal process, FHWA Submittal/Send Submittal.


The following data items are converted:



Item No.


Description


Conversion Units


3


Reporting Units


Codes 0 (English);1 (Metric)


11-12


LRS MPT/KMPT


Miles - Kilometers


30


Section Length


Miles - Kilometers


35


Roughness (IRI)


Inches/Mile - Meters/Kilometer


51


D (Slab Thickness)


Inches - Millimeters


54


Lane Width


Feet - Meters


57


Median Width


Feet - Meters


59-60


Shoulder Width (Right and Left)


Feet - Meters


63-68


Curves (6 Values)


Miles - Kilometers


72-77


Grades (6 Values)


Miles - Kilometers


79


Weighted Design Speed


MPH - km/h


80


Speed Limit


MPH - km/h



Hard Conversion

Hard conversion is accomplished via a table lookup where a current value is converted directly to a predetermined value. In these cases, the computed rounded values may not always be identical to the soft conversion value. Hard conversion is used whenever possible for the following items:



Item


Data


54


Lane Width


59-60


Right and Left Shoulder Width


79


Weighted Design Speed


80


Speed Limit


For current lane or shoulder widths from 0.3 meters to 5.6 meters (1 foot to 18 feet), the hard conversion value is as found in Tables L-3 (English to metric) and L-4 (metric to English) for Items 54, 59, and 60. Any current value which is less than the lower limit or greater than the upper limit of the appropriate portion of these tables is converted using a soft conversion (e.g., 32 feet becomes 9.8 meters).


Weighted design speed (Item 79) and speed limit (Item 80) should be coded in multiples of 5. If coded in multiples of 5, and if within the limits of Tables L-1 (5 to 75 miles per hour) or L-2 (10 to 120 kilometers per hour), a hard conversion is used; otherwise, a soft conversion is made. Where there is no speed limit, code “A999” is used for either metric or English.



Soft Conversion

A soft conversion is a computation using the current value times a conversion factor to produce a converted value (e.g., 13 feet x 0.3048 meter/foot = 3.9624 meters). Any computed value is then rounded to the required number of decimal positions (e.g., 3.9624 meters becomes 4.0 meters for a 1 decimal place precision).


The following list of factors are used when making soft conversions:



Field Units Being Converted


English to Metric


Metric to English


Miles - Kilometers


1.609344


1 / 1.609344


Feet - Meters


0.3048


1 / 0.3048


Inches per Mile - Meters per Kilometer


1 / 63.36


63.36


Inches - Millimeters


25.4


1 / 25.4


MPH - km/h


1.609344


1 / 1.609344



Soft conversion is used on the following data items:



Item No.


Description


Conversion Units


11-12


LRS MPT/KMPT


Miles - Kilometers


30


Section Length


Miles - Kilometers


35


Roughness (IRI)


Inches/Mile - Meters/Kilometer


51


D (Slab Thickness)


Inches - Millimeters


57


Median Width


Feet - Meters


63-68


Curves by Class


Miles - Kilometers


72-77


Grades by Class


Miles - Kilometers



Table L-1. Hard Conversion for Speed

ENGLISH TO METRIC — Using Factor 1.609344

MPH

km/h

Hard Conversion

km/h

Computed


5


10


8.05


10


15


16.09


15


25


24.14


20


30


32.19


25


40


40.23


30


50


48.28


35


60


56.33


40


65


64.37


45


70


72.42


50


80


80.47


55


90


88.51


60


100


96.56


65


105


104.61


70


110


112.65


75


120


120.70


BOLD indicates what is used for hard conversions.


Values beyond 75 MPH and those that are NOT multiples of 5 use soft conversions rounded to the nearest km/h.





Table L-2. Hard Conversion for Speed

METRIC TO ENGLISH — Using Factor 1 / 1.609344

km/h

MPH

Hard Conversion

MPH

Computed


10


5


6.21


15


10


9.32


20


10


12.43


25


15


15.53


30


20


18.64


35


20


21.75


40


25


24.85


45


30


27.96


50


30


31.07


55


35


34.18


60


35


37.28


65


40


40.39


70


45


43.50


75


45


46.60


80


50


49.71


85


55


52.82


90


55


55.92


95


60


59.03


100


60


62.14


105


65


65.24


110


70


68.35


115


70


71.46


120


75


74.56


BOLD indicates what is used for hard conversions.


Values beyond 10 km/h, beyond 120 km/h and those that are NOT multiples of 5 use soft conversions rounded to the nearest MPH.




Table L-3. Hard Conversion for Length

ENGLISH TO METRIC — Using Factor 0.3048


Feet

Meters

Hard Conversion

Meters

Computed


Lane Width


6


1.8


1.83


7


2.1


2.13


8


2.4


2.44


9


2.7


2.74


10


3.0


3.05


11


3.3


3.35


12


3.6


3.66


13


3.9


3.96


14


4.2


4.27


15


4.5


4.57


16


4.8


4.88


17


5.2


5.18


18


5.5


5.49


Shoulder Width


1


0.3


0.30


2


0.6


0.61


3


0.9


0.91


4


1.2


1.22


5


1.5


1.52


6


1.8


1.83


7


2.1


2.13


8


2.4


2.44


9


2.7


2.74


10


3.0


3.05


11


3.3


3.35


12


3.6


3.66


BOLD indicates what is used for hard conversions.


Values not shown for the item of interest are soft converted and rounded to the nearest tenth of a meter.


Table L-4. Hard Conversion for Length

METRIC TO ENGLISH — Using Factor 1 / 0.3048


Meters

Feet Hard Conversion

Feet Computed


Lane Width



1.7

1.8

1.9


6

6

6


5.57

5.90

6.23


2.0

2.1

2.2


7

7

7


6.56

6.89

7.21


2.3

2.4

2.5


8

8

8


7.54

7.87

8.20


2.6

2.7

2.8


9

9

9


8.52

8.85

9.18


2.9

3.0

3.1

3.2


10

10

10

10


9.51

9.84

10.16

10.49


3.3

3.4

3.5


11

11

11


10.82

11.15

11.48


3.6

3.7

3.8


12

12

12


11.80

12.13

12.46


3.9

4.0

4.1


13

13

13


12.79

13.11

13.44


4.2

4.3

4.4


14

14

14


13.77

14.10

14.43


4.5

4.6

4.7


15

15

15


14.75

15.08

15.41


4.8

4.9

5.0


16

16

16


15.74

16.07

16.39


Lane Width

(continued)


5.1

5.2

5.3


17

17

17


16.72

17.05

17.38


5.4

5.5

5.6


18

18

18


17.70

18.03

18.36



Shoulder Width


0.3

0.4


1

1


0.98

1.31


0.5

0.6

0.7


2

2

2


1.64

1.97

2.30


0.8

0.9

1.0


3

3

3


2.62

2.95

3.28


1.1

1.2

1.3


4

4

4


3.61

3.93

4.26


1.4

1.5

1.6


5

5

5


4.59

4.92

5.25


1.7

1.8

1.9


6

6

6


5.57

5.90

6.23


2.0

2.1

2.2


7

7

7


6.56

6.89

7.21


2.3

2.4

2.5


8

8

8


7.54

7.87

8.20


2.6

2.7

2.8


9

9

9


8.52

8.85

9.18


2.9

3.0

3.1

3.2


10

10

10

10


9.51

9.84

10.16

10.49


3.3

3.4

3.5


11

11

11


10.82

11.15

11.48

Shoulder Width

(continued)


3.6

3.7

3.8


12

12

12


11.80

12.13

12.46


BOLD indicates what is used for hard conversions.


Values not shown for the item of interest are soft converted and rounded to the nearest foot.



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