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Home About Fast Costing Switches Fast Costing is performed by the Schedule Server to quickly evaluate a group of candidate solutions and select the best ones to present to the user when scheduling a client trip.
Performing Fast Costing When Schedule Server performs Fast Costing on a candidate solution, it performs the following procedure:
Enabling and Configuring Fast Costing Fast Costing is enabled in either the Schedule Parameter and Violation Sets screen or the Context Properties screen.
About Context Properties Screen Fast Costing requires that the context property be set to “Street,” meaning that street routing is used to calculate trip times and distances. Setting this property to “Straight” or “Triangulation” automatically disables Fast Costing.
About this Guide PASS Schedule Server Switches Reference Guide provides information for different types of switches in Schedule Server .
About Schedule Server Schedule Server is a server application that facilitates updating, scheduling, and checking of scheduling information in the Trapeze4 Workstation.
Setting Schedule Server Switches Schedule Server switches are settings that can enable, disable, or set limits for scheduling information from Schedule Server .
About Triangulation Speed Factors Triangulation Speed Factors requires PASS "triangulation" distance calculation and speed factor calculations to calculate estimated trip times.
About Managing Speed Factors Distance and time speed factors are configured in the Speed Factors screen in the Schedule Administrator application. Speed factors can be defined for weekdays (Monday to Friday) or weekend days (Saturday and Sunday).
About Calculating Trip Costs All scheduling decisions are performed based on the “cost” of a trip.
About Bad Trip Locator The Bad Trip Locator (BTL) is an automated process that finds “bad” trips on runs and moves them to better runs.
About Batch Scheduling Batch scheduling or batching is the automated process of selecting a bunch of trips.
About Capacity Type Swapping Switches The PASS scheduling algorithm has been enhanced with capacity type swapping that enables the ability to be used on a run that is more suitable to transport a group of clients.
About Deadhead Switches Deadhead occurs when you travel in a schedule or run itinerary from one event or location to another during which there are no passengers on board the vehicle (for example, a garage to a pick-up location, or from a drop-off location to the next pick-up location); therefore, no revenue is generated during such periods.
About Fast Costing Switches Fast Costing is performed by the Schedule Server to quickly evaluate a group of candidate solutions and select the best ones to present to the user when scheduling a client trip.
Configuring Fast Costing Switches Fast Costing switches are configured in the Trace Options dialog box of the Schedule Server application window.
Performing Fast Costing When Schedule Server performs Fast Costing on a candidate solution, it performs the following procedure:
Enabling and Configuring Fast Costing Fast Costing is enabled in either the Schedule Parameter and Violation Sets screen or the Context Properties screen.
About Context Properties Screen Fast Costing requires that the context property be set to “Street,” meaning that street routing is used to calculate trip times and distances. Setting this property to “Straight” or “Triangulation” automatically disables Fast Costing.
About Schedule Parameter and Violations Sets Screen The Schedule Parameter and Violation Sets screen allows the Solution Depth and Fast Cost Depth to be defined for the Fast Costing process. For more information about this screen, refer to the “Scheduling” section of the PASS System Administrator Guide.
About Fast Costing Trace Log The following example trace log shows the calculations performed during Fast Costing for a single client trip, where the Fast Cost Depth is 10 and the Solution Depth is 5. Line entries in bold text identify the trip that was selected as the solution.
About the Trace Log Comparison of Triangulation Speed Setup The following trace log examples show how Fast Costing results can change drastically if triangulation speeds are set up too fast or too slow, possibly resulting in few or no solutions to be re-costed.
FastCost Switches and Descriptions The following switches are found in the Trace Options dialog box in the Schedule Server application expanding the folder.
Backtracking Violations Backtracking occurs when a vehicle with a passenger on board returns to or close to a location where the passenger was picked up, or passes by a destination area and leaves without dropping off the client, resulting in a Backtracking violation (BT).
About Context Properties Screen
Fast Costing requires that the context property be set to “Street,” meaning that street routing is used to
calculate trip times and distances. Setting this property to “Straight” or “Triangulation”
automatically disables Fast Costing.
Other context properties that also control the Fast Costing functionality include:
When this property is enabled, Schedule Server will disregard
the Fast Cost (FC) parameter setting (defined in the Schedule
Parameter and Violation Sets screen) and always consider Fast
Costing enabled. In other words, this property prevents the user from
turning off Fast Costing if street routing is enabled.
This optional property allows a specific violation set (created
in the Schedule Parameter and Violation Sets screen) to
be used during the Fast Costing phase of the search, which allows for more
candidate solutions to be considered. For example, during Fast Costing, the
process may allow scheduling violations such as SL10 (that is, trips may be
up to ten minutes late); however, the actual violation set configured as
part of the search may have no SL tolerance. Any top solutions within the
Fast Cost Depth (FCD) parameter that have SL10 (time and distance are
approximated during Fast Costing) would have to be re-costed and, if the
violation still exists, discarded.
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