问题描述：
英语翻译
–Second generation(centralized computer control):the individual control tasks can
be carried out by a single computer if the number of intersections is relatively
small.If several hundreds or thousands of intersections have to be coupled to the
control center,then the installation of a computer hierarchy system may be ne-
cessary;
–Third generation(distributed computer control):microprocessors allows the in-
dividual intersections to be provided with their own processing unit.Measure-
ments from detector can be locally evaluated and need no longer to be transmitted
to the control center.Two versions of distributed tra?c light control systems may
be distinguished:
1.hierarchically structured distributed control systems:in large networks,it is
necessary to have sub-control centers;
2.totally distributed tra?c control systems:no control center exists;each local
processor solves the control tasks occurring at its own intersection.
–Second generation(centralized computer control):the individual control tasks can
be carried out by a single computer if the number of intersections is relatively
small.If several hundreds or thousands of intersections have to be coupled to the
control center,then the installation of a computer hierarchy system may be ne-
cessary;
–Third generation(distributed computer control):microprocessors allows the in-
dividual intersections to be provided with their own processing unit.Measure-
ments from detector can be locally evaluated and need no longer to be transmitted
to the control center.Two versions of distributed tra?c light control systems may
be distinguished:
1.hierarchically structured distributed control systems:in large networks,it is
necessary to have sub-control centers;
2.totally distributed tra?c control systems:no control center exists;each local
processor solves the control tasks occurring at its own intersection.
问题解答：
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