From b9cea7454d65537a11a6ecbd805c683f767dd3bb Mon Sep 17 00:00:00 2001
From: Moritz Kobitzsch <moritz@mapbox.com>
Date: Fri, 18 Mar 2016 16:19:55 +0100
Subject: [PATCH] fix division by zero

---
 src/extractor/guidance/turn_analysis.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/extractor/guidance/turn_analysis.cpp b/src/extractor/guidance/turn_analysis.cpp
index 30db27fe7c6..594e180bc1d 100644
--- a/src/extractor/guidance/turn_analysis.cpp
+++ b/src/extractor/guidance/turn_analysis.cpp
@@ -794,12 +794,13 @@ TurnAnalysis::handleThreeWayTurn(const EdgeID via_edge,
                                  std::vector<ConnectedRoad> intersection) const
 {
     BOOST_ASSERT(intersection[0].turn.angle < 0.001);
-    const auto isObviousOfTwo = [](const ConnectedRoad turn, const ConnectedRoad other)
+    const auto isObviousOfTwo = [](const ConnectedRoad road, const ConnectedRoad other)
     {
-        return (angularDeviation(turn.turn.angle, STRAIGHT_ANGLE) < NARROW_TURN_ANGLE &&
+        return (angularDeviation(road.turn.angle, STRAIGHT_ANGLE) < NARROW_TURN_ANGLE &&
                 angularDeviation(other.turn.angle, STRAIGHT_ANGLE) > 85) ||
+               (angularDeviation(road.turn.angle,STRAIGHT_ANGLE) < std::numeric_limits<double>::epsilon()) ||
                (angularDeviation(other.turn.angle, STRAIGHT_ANGLE) /
-                    angularDeviation(turn.turn.angle, STRAIGHT_ANGLE) >
+                    angularDeviation(road.turn.angle, STRAIGHT_ANGLE) >
                 1.4);
     };