Two-way Prio - Revision history

Benny: typo

2013-12-04T09:14:18Z

typo

Benny: Added to research category and See also

2013-12-04T09:14:00Z

Added to research category and See also

Zerpa at 18:21, 15 March 2010

2010-03-15T18:21:44Z

Zerpa at 18:20, 15 March 2010

2010-03-15T18:20:18Z

Zerpa: Added notes on gaps and load ratios

2010-03-15T17:44:07Z

Added notes on gaps and load ratios

Zerpa at 20:18, 14 March 2010

2010-03-14T20:18:47Z

Zerpa at 20:15, 14 March 2010

2010-03-14T20:15:05Z

Zerpa at 20:07, 14 March 2010

2010-03-14T20:07:19Z

Zerpa: Created page with 'A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter …'

2010-03-14T19:48:59Z

Created page with 'A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter …'

New page

A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter the mainline. On PSG 178, we experimented with a concept named a Two-way Prio. The basic idea is that when the waiting trains begin to roll, they should keep rolling and not stop for a few trains on the ML.

@@ Line 26: / Line 26: @@
 * Handles load ratios close to 1:1 very well, and cases when the load on the lines is very dynamic.
- == See also ==
+== See also ==
 *[[Logic]]
 *[[Priority]]
 [[Category:Research]]

← Older revision		Revision as of 09:14, 4 December 2013
Line 25:		Line 25:
	* Adapts well to the traffic load. On light traffic, the logic train is usually blocked in the prio before a single train can reach it, leaving the path open.		* Adapts well to the traffic load. On light traffic, the logic train is usually blocked in the prio before a single train can reach it, leaving the path open.
	* Handles load ratios close to 1:1 very well, and cases when the load on the lines is very dynamic.		* Handles load ratios close to 1:1 very well, and cases when the load on the lines is very dynamic.
		+
		+	== See also ==
		+	*[[Logic]]
		+	*[[Priority]]
		+
		+	[[Category:Research]]

@@ Line 3: / Line 3: @@
 The two-way prio is an intermediate solution that can increase the overall throughput of a join. The basic idea is that when a waiting train gets a chance to enter the line, every train behind it should also be allowed to enter. The mechanism is similar to a real-life traffic light. It releases all traffic in one direction and then switches to the other direction and releases all traffic from there (although, the Two-way prio does not have a timeout, like traffic lights).
-[[File:twowayprio2.gif]]
+[[File:twowayprio.gif]]
 A standard prio that is highly loaded tends to generate a pattern of trains with just one of the trains from the joining line between each block of trains from the joined line, with a gap between each join. The two-way prio allows all waiting trains to enter, so there will be overall fewer gaps.

@@ Line 3: / Line 3: @@
 The two-way prio is an intermediate solution that can increase the overall throughput of a join. The basic idea is that when a waiting train gets a chance to enter the line, every train behind it should also be allowed to enter. The mechanism is similar to a real-life traffic light. It releases all traffic in one direction and then switches to the other direction and releases all traffic from there (although, the Two-way prio does not have a timeout, like traffic lights).
-[[File:twowayprio.gif]]
+[[File:twowayprio2.gif]]
 A standard prio that is highly loaded tends to generate a pattern of trains with just one of the trains from the joining line between each block of trains from the joined line, with a gap between each join. The two-way prio allows all waiting trains to enter, so there will be overall fewer gaps.

@@ Line 1: / Line 1: @@
-A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter the mainline.
+A standard prio gives priority to trains on the mainline and makes trains on the sideline wait. In some joins, especially at BBHs, a prio may build up long queues waiting to enter the mainline. The usual solution to this it to extend the mainline.
-On PSG 178, we experimented with a concept named a Two-way Prio. The basic idea is that when the waiting trains begin to roll, they should keep rolling and not stop for a few trains on the ML. The mechanism is similar to a real-life traffic light. It releases all traffic in one direction and then switches to the other direction and releases all traffic from there (although, the Two-way prio does not have a timeout, like traffic lights).
+The two-way prio is an intermediate solution that can increase the overall throughput of a join. The basic idea is that when a waiting train gets a chance to enter the line, every train behind it should also be allowed to enter. The mechanism is similar to a real-life traffic light. It releases all traffic in one direction and then switches to the other direction and releases all traffic from there (although, the Two-way prio does not have a timeout, like traffic lights).
 [[File:twowayprio.gif]]
 == How to build ==
@@ Line 12: / Line 14: @@
 A place to use this is in BBHs where neither of the MLs is more major than the other. A simple join will leave huge gaps, and a standard prio may build big queues even with good balancing.
 == Benefits ==
@@ Line 18: / Line 24: @@
 * This usually give tight packing as the entire queue is release at once.
 * Adapts well to the traffic load. On light traffic, the logic train is usually blocked in the prio before a single train can reach it, leaving the path open.

← Older revision		Revision as of 20:07, 14 March 2010
Line 1:		Line 1:
−	A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter the mainline. On PSG 178, we experimented with a concept named a Two-way Prio. The basic idea is that when the waiting trains begin to roll, they should keep rolling and not stop for a few trains on the ML.	+	A standard prio gives priority to trains on the mainline and makes trains on the sideline way. In some join, especially at BBHs, a prio may build up long queues waiting to enter the mainline. On PSG 178, we experimented with a concept named a Two-way Prio. The basic idea is that when the waiting trains begin to roll, they should keep rolling and not stop for a few trains on the ML. The mechanism is similar to a real-life traffic light. It releases all traffic in one direction and then switches to the other direction and releases all traffic from there (although, the Two-way prio does not have a timeout, like traffic lights).
		+
		+	[[File:twowayprio.gif]]
		+
		+	A place to use this is in BBHs where neither of the MLs is more major than the other. A simple join will leave huge gaps, and a standard prio may build big queues even with good balancing.