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Table 2. This table is a ‘rules as columns’ table. Each column in this table represents one rule. The condition is based on the topology and traffic data (in this case waiting queue length or travel time). Preferably these business rules are generically expressed in terms of a deviation by the traffic management norm that has been defined in the policy. However, there may be a need to define mules for a specific link or route segment due to local differences in the availability of traffic data. An example is given in table 5. For each link and route segment the operational traffic engineer must create business rules that define the problem phase of a traffic situation. Table 2 shows a generic ver- sion of this logic.

Table 2 This table is a ‘rules as columns’ table. Each column in this table represents one rule. The condition is based on the topology and traffic data (in this case waiting queue length or travel time). Preferably these business rules are generically expressed in terms of a deviation by the traffic management norm that has been defined in the policy. However, there may be a need to define mules for a specific link or route segment due to local differences in the availability of traffic data. An example is given in table 5. For each link and route segment the operational traffic engineer must create business rules that define the problem phase of a traffic situation. Table 2 shows a generic ver- sion of this logic.

Related Figures (8)

Fig. 1. Example road priority map and managed roads network. The condition under which a service is NOT available is named the restriction of the service.
Fig. 1. Example road priority map and managed roads network. The condition under which a service is NOT available is named the restriction of the service.
Table 1. symbol (‘-‘) in an output value cell is used to mean no output value, i.e., the output does not apply for the containing rule. The default DMN semantics is used meaning that the table returns the output of one rule only. It should not contain overlapping rules.
Table 1. symbol (‘-‘) in an output value cell is used to mean no output value, i.e., the output does not apply for the containing rule. The default DMN semantics is used meaning that the table returns the output of one rule only. It should not contain overlapping rules.
Table 3.
Table 3.
Table 4. The fourth principle is described by generic business rules that state when services are conflicting.
Table 4. The fourth principle is described by generic business rules that state when services are conflicting.
Services may also be started manually by a traffic operator based on a message or point in time. In that case the traffic operator is also responsible to terminate a service. The service availability conditions are still to be respected.
Services may also be started manually by a traffic operator based on a message or point in time. In that case the traffic operator is also responsible to terminate a service. The service availability conditions are still to be respected.
Service requests by link: A10R $102 > A10R $103?
Service requests by link: A10R $102 > A10R $103?
Fig.2. PPA-noord evaluation network. The traffic light systems were configured to support the services: ‘increase outbound flow’ and ‘decrease inbound flow’. The length of the waiting queues for traffic lights were measured by radar. Reroute services were not used since they were already eval- uated in the first pilot and there were no signs available in this area. A conflict handling strategy based on the road priority was programmed in the traffic light system to handle conflicting service requests.
Fig.2. PPA-noord evaluation network. The traffic light systems were configured to support the services: ‘increase outbound flow’ and ‘decrease inbound flow’. The length of the waiting queues for traffic lights were measured by radar. Reroute services were not used since they were already eval- uated in the first pilot and there were no signs available in this area. A conflict handling strategy based on the road priority was programmed in the traffic light system to handle conflicting service requests.
The results of week 52 are not representative due to a holiday in this week. There is no statistically significant other explanation for the increase in the road user satisfaction than the improved traffic conditions due to the rule approach being ‘on’ (Arcadis). The traffic engineer and traffic operator have asked to improve their common oper- ational picture by showing the results of the decision tables (problem phase) as a color on a map. None of the domain experts have a background in IT, knowledge represen- tation or business rules and that has not been a disadvantage in any way in developing this methodology and understanding the decision logic represented in decision tables.
The results of week 52 are not representative due to a holiday in this week. There is no statistically significant other explanation for the increase in the road user satisfaction than the improved traffic conditions due to the rule approach being ‘on’ (Arcadis). The traffic engineer and traffic operator have asked to improve their common oper- ational picture by showing the results of the decision tables (problem phase) as a color on a map. None of the domain experts have a background in IT, knowledge represen- tation or business rules and that has not been a disadvantage in any way in developing this methodology and understanding the decision logic represented in decision tables.
Related topics:
Business Rules & ProcessesTraffic ManagementBusiness rules
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