Proposed Changes to PA Test Method No. 431
(Last revised April 2005)
TRAFFIC ENGINEERING AND OPERATIONS DIVISION
Method of Test for
PAVEMENT MARKING SAMPLING OF LONGITUDINAL AND
TRANSVERSE LINES, LEGENDS, AND SYMBOLS FOR
RETROREFLECTOMETER TESTING
Proposed Change #1:
Add a paragraph under 2. EQUIPMENT:
2.2.3 Perform testing in dry conditions on clean , smooth* surfaces and free from snow
plowing activity .
(*test results are significantly compromised on milled, tined and/or other
coarse surfaces, i.e. Oil & Chip)
Proposed Change #2:
Revise sampling criteria in chart under paragraph 4.1:
Current Requirements:
Zone of
Measurement
All Legends and
Symbols
All Transverse
Lines
Length of
Checkpoint
Area
Number of Test
Point
Measurements
within
Checkpoint Area
3 test point
Each letter and measurements on
symbol is a
each letter and
checkpoint
symbol, in the
area
direction of travel
Each
transverse line
is a checkpoint
area
6 test point
measurements on
each transverse
line, in the
direction of travel
Acceptance
Criteria
Calculate the average
of all test points from
Each legend, symbol
or transverse line. If
the average falls
below the specified
retroreflectivity
requirements, the
marking is
unacceptable.
Proposed Requirements:
Zone of
Measurement
Length of
Checkpoint
Area
Number of Test
Point
Measurements
within
Checkpoint Area
3 test point
Each legend
measurements on
All Legends and
and
one letter of each
Symbols
symbol is a
legend, and on each
checkpoint area
symbol, in the
direction of travel
3 test point
Transverse
Each
measurements on
Lines:
transverse line
each checkpoint
24” stop lines, 6” is a checkpoint
area, in the
crosswalk lines
area
direction (or
opposite direction)
the line was placed.
3 test point
Transverse
One in ten
measurements on
Markings:
(10%)
each checkpoint
Median, Gore
markings is a
area, in the
& Yield lines
checkpoint area
direction (or
opposite direction)
the line was placed.
Acceptance
Criteria
Calculate the average
of all test points from
each legends, symbols
or transverse lines
and markings. If
the average falls
below the specified
retroreflectivity
requirements, the
marking is
unacceptable.