diff --git a/include/boost/geometry/algorithms/detail/intersection/box_box.hpp b/include/boost/geometry/algorithms/detail/intersection/box_box.hpp
index 30c31ff1e5..ff99a2290c 100644
--- a/include/boost/geometry/algorithms/detail/intersection/box_box.hpp
+++ b/include/boost/geometry/algorithms/detail/intersection/box_box.hpp
@@ -16,7 +16,7 @@
 
 
 #include <boost/geometry/algorithms/detail/intersection/interface.hpp>
-#include <boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp>
+#include <boost/geometry/algorithms/detail/intersection/box_box_implementation.hpp>
 
 
 namespace boost { namespace geometry
diff --git a/include/boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp b/include/boost/geometry/algorithms/detail/intersection/box_box_implementation.hpp
similarity index 79%
rename from include/boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp
rename to include/boost/geometry/algorithms/detail/intersection/box_box_implementation.hpp
index 31db94dd95..86478226c7 100644
--- a/include/boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp
+++ b/include/boost/geometry/algorithms/detail/intersection/box_box_implementation.hpp
@@ -11,12 +11,11 @@
 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
 
-#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP
-#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP
+#ifndef BOOST_GEOMETRY_ALGORITHMS_DETAIL_INTERSECTION_BOX_BOX_IMPLEMENTATION_HPP
+#define BOOST_GEOMETRY_ALGORITHMS_DETAIL_INTERSECTION_BOX_BOX_IMPLEMENTATION_HPP
 
 
 #include <boost/geometry/core/access.hpp>
-#include <boost/geometry/core/coordinate_type.hpp>
 
 
 namespace boost { namespace geometry
@@ -42,18 +41,16 @@ struct intersection_box_box
             BoxOut& box_out,
             Strategy const& strategy)
     {
-        typedef typename coordinate_type<BoxOut>::type ct;
-
-        ct max1 = get<max_corner, Dimension>(box1);
-        ct min2 = get<min_corner, Dimension>(box2);
+        auto max1 = get<max_corner, Dimension>(box1);
+        auto min2 = get<min_corner, Dimension>(box2);
 
         if (max1 < min2)
         {
             return false;
         }
 
-        ct max2 = get<max_corner, Dimension>(box2);
-        ct min1 = get<min_corner, Dimension>(box1);
+        auto max2 = get<max_corner, Dimension>(box2);
+        auto min1 = get<min_corner, Dimension>(box1);
 
         if (max2 < min1)
         {
@@ -93,4 +90,4 @@ struct intersection_box_box<DimensionCount, DimensionCount>
 }} // namespace boost::geometry
 
 
-#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_OVERLAY_INTERSECTION_BOX_BOX_HPP
+#endif // BOOST_GEOMETRY_ALGORITHMS_DETAIL_INTERSECTION_BOX_BOX_IMPLEMENTATION_HPP
diff --git a/include/boost/geometry/algorithms/detail/overlay/backtrack_check_si.hpp b/include/boost/geometry/algorithms/detail/overlay/backtrack_check_si.hpp
index 49d190bd0c..39d107e013 100644
--- a/include/boost/geometry/algorithms/detail/overlay/backtrack_check_si.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/backtrack_check_si.hpp
@@ -20,7 +20,6 @@
 #include <boost/range/end.hpp>
 #include <boost/range/value_type.hpp>
 
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
 #include <boost/geometry/algorithms/detail/has_self_intersections.hpp>
 #if defined(BOOST_GEOMETRY_DEBUG_INTERSECTION) || defined(BOOST_GEOMETRY_OVERLAY_REPORT_WKT)
diff --git a/include/boost/geometry/algorithms/detail/overlay/cluster_exits.hpp b/include/boost/geometry/algorithms/detail/overlay/cluster_exits.hpp
index 8c4f4c7f31..b1c7de217d 100644
--- a/include/boost/geometry/algorithms/detail/overlay/cluster_exits.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/cluster_exits.hpp
@@ -20,7 +20,6 @@
 
 #include <boost/range/value_type.hpp>
 
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/algorithms/detail/overlay/overlay_type.hpp>
 #include <boost/geometry/algorithms/detail/overlay/sort_by_side.hpp>
diff --git a/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp b/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
index 326c883b39..b6f8983e31 100644
--- a/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/get_turns.hpp
@@ -39,7 +39,6 @@
 #include <boost/geometry/algorithms/detail/sections/section_functions.hpp>
 #include <boost/geometry/algorithms/detail/sections/sectionalize.hpp>
 
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/core/coordinate_dimension.hpp>
 #include <boost/geometry/core/exterior_ring.hpp>
@@ -669,10 +668,6 @@ struct get_turns_cs
         // into account (not in the iterator, nor in the retrieve policy)
         iterator_type it = boost::begin(view);
 
-        //bool first = true;
-
-        //char previous_side[2] = {0, 0};
-
         signed_size_type index = 0;
 
         for (iterator_type prev = it++;
@@ -684,64 +679,19 @@ struct get_turns_cs
 
             unique_sub_range_from_view_policy view_unique_sub_range(view, *prev, *it, it);
 
-            /*if (first)
-            {
-                previous_side[0] = get_side<0>(box, *prev);
-                previous_side[1] = get_side<1>(box, *prev);
-            }
-
-            char current_side[2];
-            current_side[0] = get_side<0>(box, *it);
-            current_side[1] = get_side<1>(box, *it);
-
-            // There can NOT be intersections if
-            // 1) EITHER the two points are lying on one side of the box (! 0 && the same)
-            // 2) OR same in Y-direction
-            // 3) OR all points are inside the box (0)
-            if (! (
-                (current_side[0] != 0 && current_side[0] == previous_side[0])
-                || (current_side[1] != 0 && current_side[1] == previous_side[1])
-                || (current_side[0] == 0
-                        && current_side[1] == 0
-                        && previous_side[0] == 0
-                        && previous_side[1] == 0)
-                  )
-                )*/
-            if (true)
-            {
-                get_turns_with_box(seg_id, source_id2,
-                        view_unique_sub_range,
-                        box_points,
-                        intersection_strategy,
-                        robust_policy,
-                        turns,
-                        interrupt_policy);
-                // Future performance enhancement:
-                // return if told by the interrupt policy
-            }
+            get_turns_with_box(seg_id, source_id2,
+                    view_unique_sub_range,
+                    box_points,
+                    intersection_strategy,
+                    robust_policy,
+                    turns,
+                    interrupt_policy);
+            // Future performance enhancement:
+            // return if told by the interrupt policy
         }
     }
 
 private:
-    template<std::size_t Index, typename Point>
-    static inline int get_side(Box const& box, Point const& point)
-    {
-        // Inside -> 0
-        // Outside -> -1 (left/below) or 1 (right/above)
-        // On border -> -2 (left/lower) or 2 (right/upper)
-        // The only purpose of the value is to not be the same,
-        // and to denote if it is inside (0)
-
-        typename coordinate_type<Point>::type const& c = get<Index>(point);
-        typename coordinate_type<Box>::type const& left = get<min_corner, Index>(box);
-        typename coordinate_type<Box>::type const& right = get<max_corner, Index>(box);
-
-        if (geometry::math::equals(c, left)) return -2;
-        else if (geometry::math::equals(c, right)) return 2;
-        else if (c < left) return -1;
-        else if (c > right) return 1;
-        else return 0;
-    }
 
     template
     <
diff --git a/include/boost/geometry/algorithms/detail/overlay/range_in_geometry.hpp b/include/boost/geometry/algorithms/detail/overlay/range_in_geometry.hpp
index e41ee8238c..4fd69411d0 100644
--- a/include/boost/geometry/algorithms/detail/overlay/range_in_geometry.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/range_in_geometry.hpp
@@ -13,7 +13,6 @@
 
 
 #include <boost/geometry/algorithms/detail/covered_by/implementation.hpp>
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/tags.hpp>
 #include <boost/geometry/iterators/point_iterator.hpp>
 
diff --git a/include/boost/geometry/algorithms/detail/overlay/self_turn_points.hpp b/include/boost/geometry/algorithms/detail/overlay/self_turn_points.hpp
index 20369fa95a..1883e1df21 100644
--- a/include/boost/geometry/algorithms/detail/overlay/self_turn_points.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/self_turn_points.hpp
@@ -24,7 +24,6 @@
 #include <boost/geometry/algorithms/detail/overlay/get_turns.hpp>
 #include <boost/geometry/algorithms/detail/sections/section_box_policies.hpp>
 
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/coordinate_dimension.hpp>
 #include <boost/geometry/core/point_order.hpp>
 #include <boost/geometry/core/tags.hpp>
diff --git a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
index 0baf475a00..82cfb86a83 100644
--- a/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/traversal.hpp
@@ -26,7 +26,6 @@
 #include <boost/geometry/algorithms/detail/overlay/is_self_turn.hpp>
 #include <boost/geometry/algorithms/detail/overlay/sort_by_side.hpp>
 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/util/condition.hpp>
 
diff --git a/include/boost/geometry/algorithms/detail/overlay/traversal_ring_creator.hpp b/include/boost/geometry/algorithms/detail/overlay/traversal_ring_creator.hpp
index a3aec363c0..692de7345a 100644
--- a/include/boost/geometry/algorithms/detail/overlay/traversal_ring_creator.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/traversal_ring_creator.hpp
@@ -23,7 +23,6 @@
 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
 #include <boost/geometry/algorithms/detail/overlay/traversal.hpp>
 #include <boost/geometry/algorithms/num_points.hpp>
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/core/closure.hpp>
 
diff --git a/include/boost/geometry/algorithms/detail/overlay/traversal_switch_detector.hpp b/include/boost/geometry/algorithms/detail/overlay/traversal_switch_detector.hpp
index be0f2bcd87..1858c9ec2a 100644
--- a/include/boost/geometry/algorithms/detail/overlay/traversal_switch_detector.hpp
+++ b/include/boost/geometry/algorithms/detail/overlay/traversal_switch_detector.hpp
@@ -21,7 +21,11 @@
 #include <boost/geometry/algorithms/detail/overlay/cluster_info.hpp>
 #include <boost/geometry/algorithms/detail/overlay/is_self_turn.hpp>
 #include <boost/geometry/algorithms/detail/overlay/turn_info.hpp>
+
+#if defined(BOOST_GEOMETRY_DEBUG_TRAVERSAL_SWITCH_DETECTOR)
 #include <boost/geometry/core/access.hpp>
+#endif
+
 #include <boost/geometry/util/condition.hpp>
 
 #include <cstddef>
diff --git a/include/boost/geometry/algorithms/detail/sections/range_by_section.hpp b/include/boost/geometry/algorithms/detail/sections/range_by_section.hpp
index f321b40b2a..fd029db1b3 100644
--- a/include/boost/geometry/algorithms/detail/sections/range_by_section.hpp
+++ b/include/boost/geometry/algorithms/detail/sections/range_by_section.hpp
@@ -21,7 +21,6 @@
 #include <boost/range/size.hpp>
 #include <boost/range/value_type.hpp>
 
-#include <boost/geometry/core/access.hpp>
 #include <boost/geometry/core/assert.hpp>
 #include <boost/geometry/core/closure.hpp>
 #include <boost/geometry/core/exterior_ring.hpp>
diff --git a/include/boost/geometry/index/detail/algorithms/intersection_content.hpp b/include/boost/geometry/index/detail/algorithms/intersection_content.hpp
index 1a2cd28bc0..260af9eca5 100644
--- a/include/boost/geometry/index/detail/algorithms/intersection_content.hpp
+++ b/include/boost/geometry/index/detail/algorithms/intersection_content.hpp
@@ -16,7 +16,7 @@
 #define BOOST_GEOMETRY_INDEX_DETAIL_ALGORITHMS_INTERSECTION_CONTENT_HPP
 
 #include <boost/geometry/algorithms/detail/disjoint/box_box.hpp>
-#include <boost/geometry/algorithms/detail/overlay/intersection_box_box.hpp>
+#include <boost/geometry/algorithms/detail/intersection/box_box_implementation.hpp>
 
 #include <boost/geometry/index/detail/algorithms/content.hpp>