chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
chapter 3 rigid pavement - DOT On-Line Publications - Department ...
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.A thxd study was ?e?ormed 5~ :he Satior.ai Cwaeyarlve s-:is:,wtv xsssLr,y,<br />
Prqram (NCHRP 14-31.“’ Tl:is ?ro!ec, conduc:eC. in G+o:g!a ;u::ng 1575, sed 2 :3rni<br />
(16.1 km) test section to iolIow and observe razdomiy ;eiected trucks. Sboc;!der<br />
encroachment and the !on@rL;dinal :engrh oi :he ?ncroachmenr were recortied ior<br />
each selected try& tithin &he test .~ec50n. .A totai oi X5 ;rt;c.ks were ioiiowed in :he<br />
10 mi (16.1 km) section in Georgia. T?te :esuiS aCDear in rabies i, . .<br />
Iezg:h and iocat; -on or’ the encroachments is shown in figure 1. ji<br />
2 and ;:j’ Tze<br />
Item<br />
Table 1. Summary of outside shoulder encroachments<br />
by type of shoulder <strong>pavement</strong> (reference 3).<br />
Xumber of Samples<br />
Number of Trucks Encroaching<br />
Percent of Trucks Encroaching<br />
Number of Encroachments<br />
Avg. Encroachments Per Truck<br />
Encroaching.<br />
Avg. Encroachments Per Truck<br />
Avg. Vehicle Speed, km/h<br />
Note: I km/h = 0.621 mph<br />
Asphalt<br />
Conce te<br />
129.0 76.0<br />
83.0 50.0<br />
65.3 65.5<br />
398.0 279.0<br />
4.8 5.6<br />
3.1 3.7<br />
--<br />
Bituminous<br />
Suriace<br />
Treazen t iOt3i<br />
205.0<br />
133.0<br />
64.9<br />
67.0<br />
5.1<br />
Table 1 is a summary of outside shoulder encroachments by type of shouider<br />
material. Of the 205 h-u& observed, 63 percent encroached on the shoulder at ieast<br />
once within the test section. Approximately the same percentage encroached on the<br />
different types of shoulders stud&d MC and Bituminous Suriace Treatment). This<br />
seems to indicate that the delineation between a KC mainline <strong>pavement</strong> and an<br />
asphalt concrete shoulder or the rough surface of a bituminous surface treated<br />
shoulder does not necessarily deter trucks from encroachment. A total of 67<br />
shoulder encroachments were recorded, which is an average of 3.3 enaoachments per<br />
truck, per 10 miles of travel on rural interstate.<br />
Table 2 provides a summary of the number of encroachments on the outside<br />
shoulder,, by type of terrain. The percentage of trucks encroaching on the shoulder is<br />
approximately the same for both a rlat and a rolling terrain. There is not enough<br />
data on a hilly terrain to make a conclusion, but it wouid be reasonable to assume<br />
that it would be approximately the same as the others.<br />
3.8.7
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