chapter 3 rigid pavement - DOT On-Line Publications - Department ...

The results presented by Ezery :\*ere au,, -‘VT” C-3” . .,, 5~ 3 s;~:T,~ koy,e 5, ‘;exz2 LT,
the lateral piacement of trucks on a highwav du-- * i...g 1963. ” T;-,is’resea&: cart:*. isA
that approximately 3.3 percer?t of the neck’-
. r-b u
3 >am?ied com?ietelv encroached an:o :.“.e
shoulder. Complete encoac:?ment is deiined as occ-drring wb,en the duai [ire is oii
the pavement an&entirely on the shouider. Up ta 12 Fercent of the :rucks were
partiaily on the shouider, defined as occurring when the dual wheei is on the
pavement and shouider simultaneously. X main point oi this stzdv is :hat a higher
percentage of trucks (12.0 compared to the 7 -.z - round - b-v Tagarin and Emery;) are
running on the shoulder and are not being accounted ior in current highwav design
practices.
in (508 mm), as shown
Due to site limitations,
I
Werence 34
X fifth study was recentiv
completed by the
Transportation Researc:?
Laboratory at the Lrtiversitc
of Illinois in March 1988.‘4’
This study compared the
lateral distribution or truck
wheel travel paths on a 12-t-t
(3.7 m> KC fr eeway lane with
XC shoulders with two
extended KC pavement slab
widths (13.5 ft I4.1 m] and
13.7 ft (4.2 ml> that were also
delineated into 12 ft (3.7 n)
driving lanes. This is shown
in figures 2 and 3.“)
qeference l 4
The extended KC Davement
sIab test section was ‘iocated
on 3.1 mi (6.6 km) of rural
TRUCK
freeway on 1-57 in lllinois.
The southbound outside lane
3OOY
was striped as a 12-ft (3.7 m>
lane and the extended KC
pavement slab widened 28 in
(457 mm) into the shoulder.
The KC pavement extended
18 in (457 mm) beyond the
right lane stripe into the outer
shouider. The northbound
outside slab extension was 20
in figure 3.“) Both directions have asphalt concrete shoulders.
the data collection for the section was limited to one location..
3.8.11
.