In the management of construction vehicle operations, 
present practice in the Japanese construction industry is 
to manage construction vehicle operations only by the 
progress of work determined on completion of the work. If 
two or more construction vehicles are used to work on the 
same job, it is difficult to determine the efficiency of work 
being performed by each vehicle. In the management of 
rolling work during embankment construction, the quality 
of rolling is managed by measuring the degree of com 
paction with nuclear gauges or other instruments after 
rolling operations. This approach is problematic in terms 
of construction efficiency and safety. Improvement of 
construction efficiency and enhancement of safety and 
quality, therefore, require a system that is capable of 
managing the quality of rolling, such as the degree of 
compaction, in real time. 
The construction vehicle monitoring system has the fol 
lowing functions: (1) measuring the locations of construc 
tion vehicles, (2) measuring the progress of work, and (3) 
putting together information thus collected to manage the 
efficiency and quality of construction work. Real-time 
management of the efficiency and quality of construction 
can be expected to shorten the construction period 
through efficiency improvement and to enhance quality 
and safety. 
3. ROLUNG MANAGEMENT SYSTEM 
AND ITS CONFIGURATION 
The newly developed "rolling management system" is a 
construction vehicle monitoring system that is designed 
specifically for the management of the progress of work 
as measured in terms of the degree of compaction. Figure 
1 shows the configuration of the rolling management sys 
tem. The measurement unit of this system consists of 
GPS receivers used to measure the locations of construc 
tion vehicles and an assortment of instruments needed to 
measure the degree of compaction. The rolling manage 
ment system is also equipped with newly developed 
"MultiGateStation," which matches location information to 
degree-of-compaction information and enables the sys 
tem to flexibly handle different information formats re 
quired by different GPS receivers and measuring equip 
ment. The rolling management system is also capable of 
determining the degree of compaction on the basis of not 
only information supplied by the measuring equipment but 
also the number of rolling passes in a particular area. 
Figure.1 Tracking System for Rolling 
Compaction Machine by GPS 
4. MULTI GATE STATION 
Construction requires different measuring equipment de 
pending on such factors as the work to be performed and 
the object to be measured. The format of information that 
GPS receivers require to measure the locations of con 
struction vehicles also varies from manufacturer to manu 
facturer and from model to model. For a system that 
manages the progress of work on the basis of information 
supplied by measuring equipment, it is difficult to have 
provisions for every information format used by measuring 
equipment. The rolling management system, therefore, is 
equipped with the newly developed MultiGateStation, 
which performs unified management of information from 
the GPS receivers and measuring equipment installed on 
construction vehicles and transmits the received informa 
tion to the rolling management system in a format used by 
the system. 
As shown in Figure 2, MultiGateStation puts together in 
formation received from the GPS receivers and measur 
ing equipment, converts the information so that it can be 
analyzed by the system, and transmits the converted 
information to the system. To cope with unexpected inter 
ruptions of information transmission to the system, Multi 
GateStation stores measurement information.