diff --git a/README.md b/README.md
index b7f9e15..92b7c92 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# IBI WZDx .NET Library
+# WZDx .NET Library
 
 This repository contains the source code for IBI Group's [.NET 6.0](https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotnet-6) [WZDx (Work Zone Data Exchange)](https://github.com/usdot-jpo-ode/wzdx) class library, `IBI.WZDx`.
 
@@ -14,7 +14,7 @@ The library provides the following functionality:
 
 ### WZDx Version Support
 
-WZDx versions 4.0 and 4.1 are supported; the [WzdxSerializer](./src/IBI.WZDx/Serialization/WzdxSerializer.cs) defaults to outputting v4.1 (latest WZDx).
+WZDx versions 4.0, 4.1, and 4.2 are supported; the [WzdxSerializer](./src/IBI.WZDx/Serialization/WzdxSerializer.cs) defaults to outputting v4.2 (latest WZDx).
 
 [Detour road events](https://github.com/usdot-jpo-ode/wzdx/blob/main/spec-content/objects/DetourRoadEvent.md) are not supported. When provided with a Work Zone Feed that includes detour road events, the WzdxSerializer.DeserializeFeed method will deserialize the detour events into a [RoadEventFeature](./src/IBI.WZDx/Models/RoadEvents/RoadEventFeature.cs) with `Properties` as `null`.
 
@@ -75,4 +75,4 @@ This solution includes a [IBI.WZDx.UnitTests](/tests/IBI.WZDx.UnitTests/) Xunit
 
 ```
 dotnet test
-```
\ No newline at end of file
+```
diff --git a/src/IBI.WZDx/IBI.WZDx.csproj b/src/IBI.WZDx/IBI.WZDx.csproj
index b216920..d9cca1e 100644
--- a/src/IBI.WZDx/IBI.WZDx.csproj
+++ b/src/IBI.WZDx/IBI.WZDx.csproj
@@ -7,7 +7,7 @@
     <Description>Models and utitlies for producing and consuming Work Zone Data Exchange (WZDx) data feeds.</Description>
     <PackageTags>WZDx;Work Zone Data Exchange;Work Zone Feed;Road Event;Device Feed;Field Device;GeoJSON</PackageTags>
     <Authors>IBI Group</Authors>
-    <VersionPrefix>4.1.1</VersionPrefix>
+    <VersionPrefix>4.2.0</VersionPrefix>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <RepositoryType>git</RepositoryType>
diff --git a/src/IBI.WZDx/Models/FieldDevices/FieldDeviceCoreDetails.cs b/src/IBI.WZDx/Models/FieldDevices/FieldDeviceCoreDetails.cs
index 5655d45..6c7080e 100644
--- a/src/IBI.WZDx/Models/FieldDevices/FieldDeviceCoreDetails.cs
+++ b/src/IBI.WZDx/Models/FieldDevices/FieldDeviceCoreDetails.cs
@@ -72,6 +72,9 @@ namespace IBI.WZDx.Models.FieldDevices;
 /// <param name="FirmwareVersion">
 ///  The version of firmware the device is using to operate.
 /// </param>
+/// <param name="VelocityKph">
+/// The velocity of the device in kilometers per hour.
+/// </param>
 public record FieldDeviceCoreDetails(
     FieldDeviceType DeviceType,
     string DataSourceId,
@@ -89,7 +92,8 @@ public record FieldDeviceCoreDetails(
     string? Make = null,
     string? Model = null,
     string? SerialNumber = null,
-    string? FirmwareVersion = null
+    string? FirmwareVersion = null,
+    double? VelocityKph = null
     )
 {
     /// <inheritdoc/>
@@ -112,7 +116,8 @@ public virtual bool Equals(FieldDeviceCoreDetails? other)
             && Make == other.Make
             && Model == other.Model
             && SerialNumber == other.SerialNumber
-            && FirmwareVersion == other.FirmwareVersion;
+            && FirmwareVersion == other.FirmwareVersion
+            && VelocityKph == other.VelocityKph;
     }
 
     /// <inheritdoc/>
@@ -186,6 +191,11 @@ public override int GetHashCode()
             }
         }
 
+        if (VelocityKph != null)
+        {
+            hash.Add(VelocityKph);
+        }
+
         return hash.ToHashCode();
     }
 }
\ No newline at end of file
diff --git a/src/IBI.WZDx/Models/FieldDevices/FlashingBeacon.cs b/src/IBI.WZDx/Models/FieldDevices/FlashingBeacon.cs
index 825c2d5..40b6e55 100644
--- a/src/IBI.WZDx/Models/FieldDevices/FlashingBeacon.cs
+++ b/src/IBI.WZDx/Models/FieldDevices/FlashingBeacon.cs
@@ -1,8 +1,9 @@
 namespace IBI.WZDx.Models.FieldDevices;
 
 /// <summary>
-/// Describes a flashing beacon light of any form (e.g. trailer-mounted, vehicle), used to indicate
-/// something and capture driver attention.
+/// Describes a flashing warning beacon used to supplement a temporary 
+/// traffic control device. A flashing warning beacon is mounted on a sign or channelizing device 
+/// and used to indicate a warning condition and capture driver attention.
 /// </summary>
 /// <param name="CoreDetails">
 /// The core details of the flashing beacon device.
diff --git a/src/IBI.WZDx/Models/FieldDevices/MarkedLocationType.cs b/src/IBI.WZDx/Models/FieldDevices/MarkedLocationType.cs
index e4587d1..27e38fb 100644
--- a/src/IBI.WZDx/Models/FieldDevices/MarkedLocationType.cs
+++ b/src/IBI.WZDx/Models/FieldDevices/MarkedLocationType.cs
@@ -68,6 +68,11 @@ public enum MarkedLocationType
     /// </summary>
     RoadClosure,
 
+    /// <summary>
+    /// A work truck with lights flashing, actively engaged in construction or maintenance activity on the roadway.
+    /// </summary>
+    WorkTruckWithLightsFlashing,
+
     /// <summary>
     /// A temporary traffic signal.
     /// </summary>
diff --git a/src/IBI.WZDx/Models/RoadDirection.cs b/src/IBI.WZDx/Models/RoadDirection.cs
index 087e81f..02dad12 100644
--- a/src/IBI.WZDx/Models/RoadDirection.cs
+++ b/src/IBI.WZDx/Models/RoadDirection.cs
@@ -32,6 +32,16 @@ public enum RoadDirection
     /// </summary>
     Westbound,
 
+    /// <summary>
+    /// The road direction is on the inner loop of a ring road or beltway.
+    /// </summary>
+    InnerLoop,
+
+    /// <summary>
+    /// The road direction is on the outer loop of a ring road or beltway.
+    /// </summary>
+    OuterLoop,
+
     /// <summary>
     /// The road does not have a signed direction.
     /// </summary>
diff --git a/src/IBI.WZDx/Models/RoadEvents/CdsCurbZonesReference.cs b/src/IBI.WZDx/Models/RoadEvents/CdsCurbZonesReference.cs
new file mode 100644
index 0000000..1d57092
--- /dev/null
+++ b/src/IBI.WZDx/Models/RoadEvents/CdsCurbZonesReference.cs
@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using IBI.WZDx.Equality;
+
+namespace IBI.WZDx.Models.RoadEvents;
+
+/// <summary>
+/// Describes specific curb zones that are impacted by a work zone via an external reference to the
+/// curb data specification's 
+/// <see href="https://github.com/openmobilityfoundation/curb-data-specification/tree/main/curbs#curb-zone">
+/// Curb API
+/// </see>.
+/// </summary>
+/// <param name="CdsCurbZoneIds">A list of 
+/// <see href="https://github.com/openmobilityfoundation/curb-data-specification/tree/main/curbs#curb-zone">
+/// CDS Curb Zone
+/// </see> 
+/// <c>id</c>s.</param>
+/// <param name="CdsCurbsApiUrl">An identifier for the source of the requested CDS Curbs API.</param>
+public record CdsCurbZonesReference(
+    IEnumerable<string> CdsCurbZoneIds,
+    string CdsCurbsApiUrl
+    )
+{
+    /// <summary>
+    /// Determine if another <see cref="CdsCurbZonesReference"/> is equal to this <see cref="CdsCurbZonesReference"/>.
+    /// </summary>
+    public virtual bool Equals(CdsCurbZonesReference? other)
+    {
+        return other != null
+            && CdsCurbZoneIds.NullHandlingSequenceEqual(other.CdsCurbZoneIds)
+            && CdsCurbsApiUrl == other.CdsCurbsApiUrl;
+    }
+
+    /// <inheritdoc/>
+    public override int GetHashCode()
+    {
+        var hash = new HashCode();
+
+        foreach (string id in CdsCurbZoneIds)
+        {
+            hash.Add(id);
+        }
+
+        hash.Add(CdsCurbsApiUrl);
+
+        return hash.ToHashCode();
+    }
+}
diff --git a/src/IBI.WZDx/Models/RoadEvents/LaneStatus.cs b/src/IBI.WZDx/Models/RoadEvents/LaneStatus.cs
index 6c474f7..d0f0938 100644
--- a/src/IBI.WZDx/Models/RoadEvents/LaneStatus.cs
+++ b/src/IBI.WZDx/Models/RoadEvents/LaneStatus.cs
@@ -6,12 +6,12 @@ namespace IBI.WZDx.Models.RoadEvents;
 public enum LaneStatus
 {
     /// <summary>
-    /// The lane is open for travel.
+    /// The lane is open for normal usage.
     /// </summary>
     Open,
-    
+
     /// <summary>
-    /// The lane is closed to travel.
+    /// The lane is closed to normal usage.
     /// </summary>
     Closed,
 
diff --git a/src/IBI.WZDx/Models/RoadEvents/WorkZoneType.cs b/src/IBI.WZDx/Models/RoadEvents/WorkZoneType.cs
new file mode 100644
index 0000000..f063fe7
--- /dev/null
+++ b/src/IBI.WZDx/Models/RoadEvents/WorkZoneType.cs
@@ -0,0 +1,31 @@
+using IBI.WZDx.Models.RoadEvents.WorkZones;
+
+namespace IBI.WZDx.Models.RoadEvents;
+
+/// <summary>
+/// The type of <see cref="WorkZoneRoadEvent"/>.
+/// </summary>
+public enum WorkZoneType
+{
+    /// <summary>
+    /// The road event is statically placed and is not moving.
+    /// </summary>
+    Static,
+
+    /// <summary>
+    /// The road event is actively moving on the roadway.
+    /// </summary>
+    /// <remarks>
+    /// As opposed to <see cref="PlannedMovingArea"/>, the road event geometry changes at the operation moves. 
+    /// </remarks>
+    Moving,
+
+    /// <summary>
+    /// The road event is the planned extent of a moving operation. The active work area will be 
+    /// somewhere within this road event.
+    /// </summary>
+    /// <remarks>
+    /// As opposed to <see cref="Moving"/>, the road event geometry typically does not actively change. 
+    /// </remarks>
+    PlannedMovingArea
+}
diff --git a/src/IBI.WZDx/Models/RoadEvents/WorkZones/WorkZoneRoadEvent.cs b/src/IBI.WZDx/Models/RoadEvents/WorkZones/WorkZoneRoadEvent.cs
index 715901f..c6fe593 100644
--- a/src/IBI.WZDx/Models/RoadEvents/WorkZones/WorkZoneRoadEvent.cs
+++ b/src/IBI.WZDx/Models/RoadEvents/WorkZones/WorkZoneRoadEvent.cs
@@ -89,6 +89,17 @@ namespace IBI.WZDx.Models.RoadEvents.WorkZones;
 /// A list of zero or more road restrictions that apply to the roadway segment described by this
 /// road event.
 /// </param>
+/// <param name="ImpactedCdsCurbZones">
+/// A list of references to external 
+/// <see href="https://github.com/openmobilityfoundation/curb-data-specification/tree/main/curbs#curb-zone">
+/// CDS Curb Zones
+/// </see> 
+/// impacted by the work zone.
+/// </param>
+/// <param name="WorkZoneType">
+/// The type of work zone road event, such as if the road event is static or actively moving as part
+/// of a moving operation.
+/// </param>
 public record WorkZoneRoadEvent(
     RoadEventCoreDetails CoreDetails,
     DateTimeOffset StartDate,
@@ -113,7 +124,9 @@ public record WorkZoneRoadEvent(
     IEnumerable<TypeOfWork>? TypesOfWork = null,
     WorkerPresence? WorkerPresence = null,
     double? ReducedSpeedLimitKph = null,
-    IEnumerable<Restriction>? Restrictions = null
+    IEnumerable<Restriction>? Restrictions = null,
+    IEnumerable<CdsCurbZonesReference>? ImpactedCdsCurbZones = null,
+    WorkZoneType? WorkZoneType = null
     ) : IRoadEvent
 {
     /// <summary>
@@ -144,7 +157,9 @@ public virtual bool Equals(WorkZoneRoadEvent? other)
             && TypesOfWork.NullHandlingSequenceEqual(other.TypesOfWork)
             && WorkerPresence == other.WorkerPresence
             && ReducedSpeedLimitKph == other.ReducedSpeedLimitKph
-            && Restrictions.NullHandlingSequenceEqual(other.Restrictions);
+            && Restrictions.NullHandlingSequenceEqual(other.Restrictions)
+            && ImpactedCdsCurbZones.NullHandlingSequenceEqual(other.ImpactedCdsCurbZones)
+            && WorkZoneType == other.WorkZoneType;
     }
 
     /// <inheritdoc/>
@@ -199,6 +214,16 @@ public override int GetHashCode()
             }
         }
 
+        if (ImpactedCdsCurbZones != null)
+        {
+            foreach (CdsCurbZonesReference cdsCurbZonesReference in ImpactedCdsCurbZones)
+            {
+                hash.Add(cdsCurbZonesReference);
+            }
+        }
+
+        hash.Add(WorkZoneType);
+
         return hash.ToHashCode();
     }
 }
\ No newline at end of file
diff --git a/tests/IBI.WZDx.UnitTests/WzdxSerializerTests.cs b/tests/IBI.WZDx.UnitTests/WzdxSerializerTests.cs
index 8d5ba04..709aac6 100644
--- a/tests/IBI.WZDx.UnitTests/WzdxSerializerTests.cs
+++ b/tests/IBI.WZDx.UnitTests/WzdxSerializerTests.cs
@@ -122,7 +122,8 @@ string expectedFeedJson
                                         Make: "Ver-Mac",
                                         Model: "AB-1",
                                         SerialNumber: "1234567890",
-                                        FirmwareVersion: "1.0.0"
+                                        FirmwareVersion: "1.0.0",
+                                        VelocityKph: 10.1
                                         ),
                                     Pattern: ArrowBoardPattern.RightArrowFlashing,
                                     IsMoving: false,
@@ -366,7 +367,8 @@ string expectedFeedJson
                                         ""make"": ""Ver-Mac"",
                                         ""model"": ""AB-1"",
                                         ""serial_number"": ""1234567890"",
-                                        ""firmware_version"": ""1.0.0""
+                                        ""firmware_version"": ""1.0.0"",
+                                        ""velocity_kph"": 10.1
                                     },
                                     ""pattern"": ""right-arrow-flashing"",
                                     ""is_moving"": false,
@@ -804,11 +806,20 @@ string expectedFeedJson
                                     Restrictions: new Restriction[]
                                     {
                                         new Restriction(RestrictionType.NoTrucks)
-                                    }
+                                    },
+                                    ImpactedCdsCurbZones: new CdsCurbZonesReference[]
+                                    {
+                                        new CdsCurbZonesReference(
+                                            CdsCurbZoneIds: new string[] { "Zone Id 1", "Zone Id 2" },
+                                            CdsCurbsApiUrl: "API Url"
+                                            )
+                                    },
+                                    WorkZoneType: WorkZoneType.Static
                                     ),
                                 Geometry: new RoadEventFeatureGeometry(
                                     Type: RoadEventFeatureGeometryType.LineString,
-                                    Coordinates: new double[][] {
+                                    Coordinates: new double[][]
+                                    {
                                         new double[]
                                         {
                                             -93.77668405099996,
@@ -962,7 +973,14 @@ string expectedFeedJson
                                         {
                                             ""type"": ""no-trucks""
                                         }
-                                    ]
+                                    ],
+                                    ""impacted_cds_curb_zones"": [
+                                        {
+                                            ""cds_curb_zone_ids"": [ ""Zone Id 1"", ""Zone Id 2"" ],
+                                            ""cds_curbs_api_url"": ""API Url""
+                                        }
+                                    ],
+                                    ""work_zone_type"": ""static""
                                 },
                                 ""geometry"": {
                                     ""type"": ""LineString"",
@@ -1891,4 +1909,4 @@ private static void DeserializeFeed_JsonNotValid_ThrowsJsonException<TWzdxFeed>(
 
         Assert.Throws<JsonException>(action);
     }
-}
\ No newline at end of file
+}