From 1be5765bb2260883b43cad52d1ffce1223fc4bb7 Mon Sep 17 00:00:00 2001
From: namdre <namdre.sumo@gmail.com>
Date: Fri, 2 Mar 2018 08:06:35 +0100
Subject: [PATCH] fixing special case (was triggering assertion) refs #3861

---
 src/microsim/MSLink.cpp | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/src/microsim/MSLink.cpp b/src/microsim/MSLink.cpp
index ed115f3660a..9b86913cffa 100644
--- a/src/microsim/MSLink.cpp
+++ b/src/microsim/MSLink.cpp
@@ -220,15 +220,17 @@ MSLink::setRequestInformation(int index, bool hasFoes, bool isCont,
                     //    we want to make sure that both vehicles have the same distance to the crossing point and thus follow each other naturally
                     std::vector<double> distances = l.distances(s);
                     assert(distances.size() == l.size() + s.size());
-                    for (int j = s.size() - 2; j >= 0; j--) {
-                        int i = j + l.size();
-                        const double segLength = s[j].distanceTo2D(s[j + 1]);
-                        if (distances[i] > minDist) {
-                            lbcSibling += segLength;
-                        } else {
-                            // assume no sharp bends and just interpolate the last segment
-                            lbcSibling += segLength - (minDist - distances[i]) * segLength /  (distances[i + 1] - distances[i]);
-                            break;
+                    if (distances.back() > minDist) {
+                        for (int j = s.size() - 2; j >= 0; j--) {
+                            int i = j + l.size();
+                            const double segLength = s[j].distanceTo2D(s[j + 1]);
+                            if (distances[i] > minDist) {
+                                lbcSibling += segLength;
+                            } else {
+                                // assume no sharp bends and just interpolate the last segment
+                                lbcSibling += segLength - (minDist - distances[i]) * segLength /  (distances[i + 1] - distances[i]);
+                                break;
+                            }
                         }
                     }
                     assert(lbcSibling >= -NUMERICAL_EPS);