diff --git a/index.html b/index.html
index 9cdea5a66..490ee3843 100644
--- a/index.html
+++ b/index.html
@@ -43,6 +43,7 @@
         <script src="js/id/geo.js"></script>
         <script src="js/id/geo/extent.js"></script>
         <script src="js/id/geo/multipolygon.js"></script>
+        <script src="js/id/geo/turn.js"></script>
 
         <script src='js/id/renderer/background.js'></script>
         <script src='js/id/renderer/background_source.js'></script>
diff --git a/js/id/geo/turn.js b/js/id/geo/turn.js
new file mode 100644
index 000000000..296a43e31
--- /dev/null
+++ b/js/id/geo/turn.js
@@ -0,0 +1,62 @@
+iD.geo.turns = function(graph, entityID) {
+    var way = graph.entity(entityID);
+    if (way.type !== 'way' || !way.tags.highway || way.isArea())
+        return [];
+
+    function withRestriction(turn) {
+        graph.parentRelations(turn.from).forEach(function(relation) {
+            if (relation.tags.type !== 'restriction')
+                return;
+
+            var f = relation.memberByRole('from'),
+                t = relation.memberByRole('to'),
+                v = relation.memberByRole('via');
+
+            if (f && f.id === turn.from.id &&
+                t && t.id === turn.to.id &&
+                v && v.id === turn.via.id) {
+                turn.restriction = relation;
+            }
+        });
+
+        return turn;
+    }
+
+    var turns = [];
+
+    [way.first(), way.last()].forEach(function(nodeID) {
+        var node = graph.entity(nodeID);
+        graph.parentWays(node).forEach(function(parent) {
+            if (parent === way || parent.isDegenerate() || !parent.tags.highway)
+                return;
+            if (way.first() === node.id && way.tags.oneway === 'yes')
+                return;
+            if (way.last() === node.id && way.tags.oneway === '-1')
+                return;
+
+            var index = parent.nodes.indexOf(node.id);
+
+            // backward
+            if (parent.first() !== node.id && parent.tags.oneway !== 'yes') {
+                turns.push(withRestriction({
+                    from: way,
+                    to: parent,
+                    via: node,
+                    toward: graph.entity(parent.nodes[index - 1])
+                }));
+            }
+
+            // forward
+            if (parent.last() !== node.id && parent.tags.oneway !== '-1') {
+                turns.push(withRestriction({
+                    from: way,
+                    to: parent,
+                    via: node,
+                    toward: graph.entity(parent.nodes[index + 1])
+                }));
+            }
+       });
+    });
+
+    return turns;
+};
diff --git a/test/index.html b/test/index.html
index 185528971..1ecab3f75 100644
--- a/test/index.html
+++ b/test/index.html
@@ -44,6 +44,7 @@
     <script src="../js/id/geo.js"></script>
     <script src="../js/id/geo/extent.js"></script>
     <script src="../js/id/geo/multipolygon.js"></script>
+    <script src="../js/id/geo/turn.js"></script>
 
     <script src='../js/id/renderer/background.js'></script>
     <script src='../js/id/renderer/background_source.js'></script>
@@ -221,6 +222,7 @@
 
     <script src="spec/geo/extent.js"></script>
     <script src="spec/geo/multipolygon.js"></script>
+    <script src="spec/geo/turn.js"></script>
 
     <script src="spec/core/connection.js"></script>
     <script src="spec/core/graph.js"></script>
diff --git a/test/index_packaged.html b/test/index_packaged.html
index f187c3925..dbdecfc1c 100644
--- a/test/index_packaged.html
+++ b/test/index_packaged.html
@@ -50,6 +50,7 @@
 
     <script src="spec/geo/extent.js"></script>
     <script src="spec/geo/multipolygon.js"></script>
+    <script src="spec/geo/turn.js"></script>
 
     <script src="spec/core/connection.js"></script>
     <script src="spec/core/graph.js"></script>
diff --git a/test/spec/geo/turn.js b/test/spec/geo/turn.js
new file mode 100644
index 000000000..e4d378667
--- /dev/null
+++ b/test/spec/geo/turn.js
@@ -0,0 +1,276 @@
+describe("iD.geo.turns", function() {
+    it("returns an empty array for non-ways", function() {
+        var graph = iD.Graph({
+            'n': iD.Node({id: 'n'})
+        });
+        expect(iD.geo.turns(graph, 'n')).to.eql([]);
+    });
+
+    it("returns an empty array for non-lines", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential', area: 'yes'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("returns an empty array for an unconnected way", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v']})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns onto degenerate ways", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns from non-highways", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v']}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns onto non-highways", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w']})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns onto non-lines", function() {
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            'x': iD.Node({id: 'x'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w', 'x', 'v'], tags: {highway: 'residential', area: 'yes'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("permits turns onto a way forward", function() {
+        // u====v--->w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("permits turns onto a way backward", function() {
+        // u====v<---w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['w', 'v'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("permits turns onto a way in both directions", function() {
+        //     w
+        //     |
+        // u===v
+        //     |
+        //     x
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            'x': iD.Node({id: 'x'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['w', 'v', 'x'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }, {
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('x')
+        }]);
+    });
+
+    it("permits turns from a oneway forward", function() {
+        // u===>v----w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential', oneway: 'yes'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("permits turns from a reverse oneway backward", function() {
+        // u<===v----w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['v', 'u'], tags: {highway: 'residential', oneway: '-1'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("omits turns from a oneway backward", function() {
+        // u<===v----w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['v', 'u'], tags: {highway: 'residential', oneway: 'yes'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns from a reverse oneway forward", function() {
+        // u===>v----w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential', oneway: '-1'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("permits turns onto a oneway forward", function() {
+        // u====v--->w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential', oneway: 'yes'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("permits turns onto a reverse oneway backward", function() {
+        // u====v<---w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['w', 'v'], tags: {highway: 'residential', oneway: '-1'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w')
+        }]);
+    });
+
+    it("omits turns onto a oneway backward", function() {
+        // u====v<---w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['w', 'v'], tags: {highway: 'residential', oneway: 'yes'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("omits turns onto a reverse oneway forward", function() {
+        // u====v--->w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential', oneway: '-1'}})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([]);
+    });
+
+    it("restricts turns with a restriction relation", function() {
+        // u====v--->w
+        var graph = iD.Graph({
+            'u': iD.Node({id: 'u'}),
+            'v': iD.Node({id: 'v'}),
+            'w': iD.Node({id: 'w'}),
+            '=': iD.Way({id: '=', nodes: ['u', 'v'], tags: {highway: 'residential'}}),
+            '-': iD.Way({id: '-', nodes: ['v', 'w'], tags: {highway: 'residential'}}),
+            'r': iD.Relation({id: 'r', tags: {type: 'restriction'}, members: [
+                {id: '=', role: 'from', type: 'way'},
+                {id: '-', role: 'to', type: 'way'},
+                {id: 'v', role: 'via', type: 'node'}
+            ]})
+        });
+        expect(iD.geo.turns(graph, '=')).to.eql([{
+            from: graph.entity('='),
+            to: graph.entity('-'),
+            via: graph.entity('v'),
+            toward: graph.entity('w'),
+            restriction: graph.entity('r')
+        }]);
+    });
+
+    // U-turns
+    // Self-intersections
+    // Split point
+});