Review fixes.

routing/bicycle_directions.cpp

@@ -190,6 +190,7 @@ void BicycleDirectionsEngine::Generate(IRoadGraph const & graph, vector<Junction
 
   MakeTurnAnnotation(resultGraph, delegate, routeGeometry, turns, turnAnnotationTimes,
                      streetNames, trafficSegs);
+
   // @TODO(bykoianko) The invariant below it's an issue but now it's so and it should be checked.
   // The problem is every edge is added as a pair of points to route geometry.
   // So all the points except for beginning and ending are duplicated. It should

routing/route.cpp

@@ -382,6 +382,9 @@ void Route::AppendTraffic(Route const & route)
   if (route.GetTraffic().empty())
   {
     CHECK_GREATER_OR_EQUAL(route.m_poly.GetPolyline().GetSize(), 1, ());
+    // Note. It's necessary to deduct 1 because size of |route.m_poly|
+    // is one less then number of segments of |route.m_poly|. And if |route.m_traffic|
+    // were not empty it would had had route.m_poly.GetPolyline().GetSize() - 1 items.
     m_traffic.insert(m_traffic.end(),
                      route.m_poly.GetPolyline().GetSize() - 1 /* number of segments is less by one */,
                      SpeedGroup::Unknown);