| dc.description.abstract | Skid number, concerning road traffic safety, is an important issue of our national freeway
system that carries a heavy traffic flow. The national freeway system is the economic arteries
in Taiwan, four national freeways of which go through Taiwan from north to south,
complemented by five national freeways from east to west. The national freeway system has
enhanced the convenience of transporting throughout the island greatly and has become
indispensable for the people of this island. Therefore, we can tell that the quality of our
national freeway must be the focus of the whole country’s attention, and among all the
freeness and safety of traffic are most important. I thus have chosen to analyze the freeness
and safety of traffic of our national freeway in this study.
In order to enhance the traffic freeness and safety of our national freeway, this study will
focus on traffic flow and proceed to following related analysis. First of all, I achieved a full
comprehension of the entries and methods of the general survey on the present pavement of
our national freeway. Secondly, to cope with the general survey of skid number of the national
freeway, which concerns the road traffic safety, I have customized a complete survey plan for
the national freeway, and finished the general survey by June, 2013. The survey and the
following related analysis would be beneficial to the maintenance and enhancement of the
traffic freeness and road traffic safety of our national freeway.
To improve road traffic safety requires figuring out the degradation equation of the skid
number. First, I conducted a correlation analysis between the skid number and the traffic flow,
and between the skid number and the climate data. Then I discovered that the correlation
between the skid number and the traffic flow is higher, while the correlation between the skid
number and the climate, namely the temperature and the rainfall, is lower. Adopting traffic
flow and climate as the factors of the degradation equation of the skid number, this study divides the data of traffic flow of the entire national freeway system into five groups, and thus
is able to present each degradation equation of skid number of various traffic flow, and helps
maintain and elevate the level of road traffic safety of the national freeway.
Various kinds of vehicles run over the pavement of the national freeway night and day,
and once the degradation of pavement exceeds the related standard, the road demands
maintenance. Among all methods of maintenance construction, it is the medium- to long-term
construction that has more significant and longer impact on the people. For the sake of the
freeway users’ satisfaction during maintenance construction, I have adopted service level in
the calculation and analysis of the traffic flow of the entire freeway system. On the premise
that the service level doesn’t fall into the lowest rank, this study has concluded the
recommended approach of traffic maintenance for different sections of the national freeway,
which helps maintain and improve the free flow of the national freeway | en_US |