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-rw-r--r--src/pathfinder/yapf/yapf_base.hpp15
-rw-r--r--src/pathfinder/yapf/yapf_costrail.hpp3
2 files changed, 17 insertions, 1 deletions
diff --git a/src/pathfinder/yapf/yapf_base.hpp b/src/pathfinder/yapf/yapf_base.hpp
index f63dcf04a..0f88d058e 100644
--- a/src/pathfinder/yapf/yapf_base.hpp
+++ b/src/pathfinder/yapf/yapf_base.hpp
@@ -224,6 +224,21 @@ public:
}
/**
+ * In some cases an intermediate node branch should be pruned.
+ * The most prominent case is when a red EOL signal is encountered, but
+ * there was a segment change (e.g. a rail type change) before that. If
+ * the branch would not be pruned, the rail type change location would
+ * remain the best intermediate node, and thus the vehicle would still
+ * go towards the red EOL signal.
+ */
+ void PruneIntermediateNodeBranch()
+ {
+ while (Yapf().m_pBestIntermediateNode != NULL && (Yapf().m_pBestIntermediateNode->m_segment->m_end_segment_reason & ESRB_CHOICE_FOLLOWS) == 0) {
+ Yapf().m_pBestIntermediateNode = Yapf().m_pBestIntermediateNode->m_parent;
+ }
+ }
+
+ /**
* AddNewNode() - called by Tderived::PfFollowNode() for each child node.
* Nodes are evaluated here and added into open list
*/
diff --git a/src/pathfinder/yapf/yapf_costrail.hpp b/src/pathfinder/yapf/yapf_costrail.hpp
index 44647443b..c6080f2a1 100644
--- a/src/pathfinder/yapf/yapf_costrail.hpp
+++ b/src/pathfinder/yapf/yapf_costrail.hpp
@@ -212,7 +212,8 @@ public:
/* we have a red signal in our direction
* was it first signal which is two-way? */
if (!IsPbsSignal(sig_type) && Yapf().TreatFirstRedTwoWaySignalAsEOL() && n.flags_u.flags_s.m_choice_seen && has_signal_against && n.m_num_signals_passed == 0) {
- /* yes, the first signal is two-way red signal => DEAD END */
+ /* yes, the first signal is two-way red signal => DEAD END. Prune this branch... */
+ Yapf().PruneIntermediateNodeBranch();
n.m_segment->m_end_segment_reason |= ESRB_DEAD_END;
Yapf().m_stopped_on_first_two_way_signal = true;
return -1;