diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa9ecef83..845576299 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changes to Mapbox Directions for Swift
 
+## main
+
+* This library requires Turf v2.0.0-alpha.2. ([#517](https://github.com/mapbox/mapbox-directions-swift/pull/517))
+* This library does not support tvOS, watchOS, or Linux. Support for these platforms will be restored before the final release. ([#517](https://github.com/mapbox/mapbox-directions-swift/pull/517))
+* The `Incident.impact` property is now an `Incident.Impact` value instead of a string. ([#519](https://github.com/mapbox/mapbox-directions-swift/pull/519))
+
 ## v1.2.0
 
 ### Packaging
diff --git a/Sources/MapboxDirections/Incident.swift b/Sources/MapboxDirections/Incident.swift
index 7baf5ae27..38a91a88b 100644
--- a/Sources/MapboxDirections/Incident.swift
+++ b/Sources/MapboxDirections/Incident.swift
@@ -50,7 +50,21 @@ public struct Incident: Codable, Equatable {
         /// Weather
         case weather = "weather"
     }
-    
+
+    /// Represents the impact of the incident on local traffic.
+    public enum Impact: String, Codable {
+        /// Unknown impact
+        case unknown
+        /// Critical impact
+        case critical
+        /// Major impact
+        case major
+        /// Minor impact
+        case minor
+        /// Low impact
+        case low
+    }
+
     /// Incident identifier
     public var identifier: String
     /// The kind of an incident
@@ -69,7 +83,7 @@ public struct Incident: Codable, Equatable {
     /// Date when incident shall end.
     public var endDate: Date
     /// Shows severity of an incident. May be not available for all incident types.
-    public var impact: String?
+    public var impact: Impact?
     /// Provides additional classification of an incident. May be not available for all incident types.
     public var subtype: String?
     /// Breif description of the subtype. May be not available for all incident types and is not available if `subtype` is `nil`
@@ -91,7 +105,7 @@ public struct Incident: Codable, Equatable {
                 creationDate: Date,
                 startDate: Date,
                 endDate: Date,
-                impact: String?,
+                impact: Impact?,
                 subtype: String?,
                 subtypeDescription: String?,
                 alertCodes: Set<Int>,
@@ -142,7 +156,7 @@ public struct Incident: Codable, Equatable {
                                                    debugDescription: "`Intersection.endTime` is encoded with invalid format.")
         }
         
-        impact = try container.decodeIfPresent(String.self, forKey: .impact)
+        impact = try container.decodeIfPresent(Impact.self, forKey: .impact)
         subtype = try container.decodeIfPresent(String.self, forKey: .subtype)
         subtypeDescription = try container.decodeIfPresent(String.self, forKey: .subtypeDescription)
         alertCodes = try container.decode(Set<Int>.self, forKey: .alertCodes)
diff --git a/Tests/MapboxDirectionsTests/RouteStepTests.swift b/Tests/MapboxDirectionsTests/RouteStepTests.swift
index 3d4d9a708..78a4a4dfb 100644
--- a/Tests/MapboxDirectionsTests/RouteStepTests.swift
+++ b/Tests/MapboxDirectionsTests/RouteStepTests.swift
@@ -329,6 +329,7 @@ class RouteStepTests: XCTestCase {
             XCTAssertNotNil(newRoute)
             
             XCTAssert(newRoute!.legs.first!.incidents!.first!.kind == Incident.Kind.miscellaneous)
+            XCTAssert(newRoute!.legs.first!.incidents!.first!.impact == Incident.Impact.minor)
             XCTAssert(newRoute!.legs.first!.incidents![0].lanesBlocked!.contains(.right))
             XCTAssertNil(newRoute!.legs.first!.incidents![1].lanesBlocked)
             XCTAssert(newRoute!.legs.first!.incidents![2].lanesBlocked!.isEmpty)