Started to implement road generation.

Game/Assets/Scripts/Model/Road/RoadNetwork.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace TransportGame.Model.Road
+{
+    [XmlRoot("roadNetwork")]
+    public class RoadNetwork
+    {
+        private int lastNodeId = -1, lastSegmentId = -1;
+
+        /// <summary>
+        /// Gets or sets the road nodes
+        /// </summary>
+        [XmlIgnore]
+        public Dictionary<int, RoadNode> Nodes { get; private set; }
+
+        /// <summary>
+        /// Gets or sets the road segments for the articulation graph
+        /// </summary>
+        [XmlIgnore]
+        public Dictionary<int, RoadSegment> ArticulationSegments { get; private set; }
+
+
+        /// <summary>
+        /// Gets or sets the road segments for the intersection graph
+        /// </summary>
+        [XmlIgnore]
+        public Dictionary<int, RoadSegment> IntersectionSegments { get; private set; }
+
+        /// <summary>
+        /// Gets or sets the nodes
+        /// </summary>
+        [XmlArray("nodes")]
+        public RoadNode[] NodesArray
+        {
+            get
+            {
+                return Nodes.Values.ToArray();
+            }
+            set
+            {
+                Nodes.Clear();
+                foreach (var node in value)
+                    Nodes.Add(node.Id, node);
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the segments
+        /// </summary>
+        [XmlArray("articulationGraph")]
+        public RoadSegment[] ArticulationSegmentsArray
+        {
+            get
+            {
+                return ArticulationSegments.Values.ToArray();
+            }
+            set
+            {
+                ArticulationSegments.Clear();
+                foreach (var segment in value)
+                    ArticulationSegments.Add(segment.Id, segment);
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the segments
+        /// </summary>
+        [XmlArray("intersectionGraph")]
+        public RoadSegment[] IntersectionSegmentsArray
+        {
+            get
+            {
+                return ArticulationSegments.Values.ToArray();
+            }
+            set
+            {
+                ArticulationSegments.Clear();
+                foreach (var segment in value)
+                    ArticulationSegments.Add(segment.Id, segment);
+            }
+        }
+    
+        /// <summary>
+        /// Creates a node and returns it
+        /// </summary>
+        /// <returns>Created node</returns>
+        public RoadNode CreateNode()
+        {
+            // Skip IDs that already exist
+            while (Nodes.ContainsKey(++lastNodeId)) ;
+
+            // Create node
+            RoadNode node = new RoadNode()
+            {
+                Id = lastNodeId,
+                ParentNetwork = this
+            };
+
+            Nodes.Add(node.Id, node);
+            return node;
+        }
+
+        /// <summary>
+        /// Creates a segment and returns it
+        /// </summary>
+        /// <returns>Created segment</returns>
+        public RoadSegment CreateArticulationSegment()
+        {
+            // Skip IDs that already exist
+            while (ArticulationSegments.ContainsKey(++lastSegmentId)) ;
+
+            // Create segment
+            RoadSegment segment = new RoadSegment()
+            {
+                Id = lastSegmentId,
+                ParentNetwork = this
+            };
+
+            ArticulationSegments.Add(segment.Id, segment);
+            return segment;
+        }
+
+        /// <summary>
+        /// Creates a segment and returns it
+        /// </summary>
+        /// <returns>Created segment</returns>
+        public RoadSegment CreateIntersectionSegment()
+        {
+            // Skip IDs that already exist
+            while (IntersectionSegments.ContainsKey(++lastSegmentId)) ;
+
+            // Create segment
+            RoadSegment segment = new RoadSegment()
+            {
+                Id = lastSegmentId,
+                ParentNetwork = this
+            };
+
+            IntersectionSegments.Add(segment.Id, segment);
+            return segment;
+        }
+    }
+}

Game/Assets/Scripts/Model/Road/RoadNetwork.cs.meta

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+timeCreated: 1431612790
+licenseType: Free
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Game/Assets/Scripts/Model/Road/RoadNode.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace TransportGame.Model.Road
+{
+    /// <summary>
+    /// Road node
+    /// </summary>
+    [XmlRoot("node")]
+    public class RoadNode
+    {
+        /// <summary>
+        /// Gets or sets a unique identifier for this node
+        /// </summary>
+        [XmlAttribute("id")]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// Gets or sets the X coordinate of the node
+        /// </summary>
+        [XmlAttribute("x")]
+        public float X { get; set; }
+
+        /// <summary>
+        /// Gets or sets the Y coordinate of the node
+        /// </summary>
+        [XmlAttribute("y")]
+        public float Y { get; set; }
+
+        /// <summary>
+        /// Gets or sets the adjacent articulation segment IDs
+        /// </summary>
+        [XmlArray("articulationSegments")]
+        [XmlArrayItem("id")]
+        public List<int> ArticulationSegmentIds { get; set; }
+
+        /// <summary>
+        /// Gets or sets the adjacent articulation segment IDs
+        /// </summary>
+        [XmlArray("intersectionSegments")]
+        [XmlArrayItem("id")]
+        public List<int> IntersectionSegmentIds { get; set; }
+
+        /// <summary>
+        /// Gets or sets the parent network
+        /// </summary>
+        [XmlIgnore]
+        public RoadNetwork ParentNetwork { get; set; }
+
+        /// <summary>
+        /// Gets the adjacent articulation segments
+        /// </summary>
+        [XmlIgnore]
+        public IEnumerable<RoadSegment> ArticulationSegments
+        {
+            get
+            {
+                return ArticulationSegmentIds.Select(id => ParentNetwork.ArticulationSegments[id]);
+            }
+        }
+
+        /// <summary>
+        /// Gets the adjacent setments
+        /// </summary>
+        [XmlIgnore]
+        public IEnumerable<RoadSegment> Segments
+        {
+            get
+            {
+                return IntersectionSegmentIds.Select(id => ParentNetwork.ArticulationSegments[id]);
+            }
+        }
+
+        /// <summary>
+        /// Initializes the node
+        /// </summary>
+        public RoadNode()
+        {
+            ArticulationSegmentIds = new List<int>();
+            IntersectionSegmentIds = new List<int>();
+        }
+    }
+}

Game/Assets/Scripts/Model/Road/RoadNode.cs.meta

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Game/Assets/Scripts/Model/Road/RoadSegment.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Xml.Serialization;
+
+namespace TransportGame.Model.Road
+{
+    /// <summary>
+    /// Represents a road segment
+    /// </summary>
+    [XmlRoot("segment")]
+    public class RoadSegment
+    {
+        /// <summary>
+        /// Gets or sets the id
+        /// </summary>
+        [XmlAttribute("id")]
+        public int Id { get; set; }
+
+        /// <summary>
+        /// Gets or sets the parent network
+        /// </summary>
+        [XmlIgnore]
+        public RoadNetwork ParentNetwork { get; set; }
+
+        /// <summary>
+        /// Gets or sets the id of the first terminal
+        /// </summary>
+        [XmlAttribute("term1")]
+        public int Terminal1Id { get; set; }
+
+        /// <summary>
+        /// Gets or sets the id of the second terminal
+        /// </summary>
+        [XmlAttribute("term2")]
+        public int Terminal2Id { get; set; }
+
+        /// <summary>
+        /// Gets or sets the first terminal
+        /// </summary>
+        [XmlIgnore]
+        public RoadNode Terminal1
+        {
+            get
+            {
+                return ParentNetwork.Nodes[Terminal1Id];
+            }
+            set
+            {
+                Terminal1Id = value.Id;
+            }
+        }
+        
+        /// <summary>
+        /// Gets or sets the second terminal
+        /// </summary>
+        [XmlIgnore]
+        public RoadNode Terminal2
+        {
+            get
+            {
+                return ParentNetwork.Nodes[Terminal2Id];
+            }
+            set
+            {
+                Terminal2Id = value.Id;
+            }
+        }
+
+        /// <summary>
+        /// Gets or sets the number of lanes going from terminal 1 to terminal 2
+        /// </summary>
+        [XmlAttribute("lanesTo2")]
+        public int LanesTo2 { get; set; }
+
+        /// <summary>
+        /// Gets or sets the number of lanes going form terminal 2 to terminal 1
+        /// </summary>
+        [XmlAttribute("lanesTo1")]
+        public int LanesTo1 { get; set; }
+
+        /// <summary>
+        /// Initializes road segment
+        /// </summary>
+        public RoadSegment()
+        {
+            LanesTo1 = 1;
+            LanesTo2 = 1;
+        }
+    }
+}

Game/Assets/Scripts/Model/Road/RoadSegment.cs.meta

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