diff --git a/IrisCompanion/iris/DataSources/TFLDataSource.swift b/IrisCompanion/iris/DataSources/TFLDataSource.swift
index b2b05b7..f128005 100644
--- a/IrisCompanion/iris/DataSources/TFLDataSource.swift
+++ b/IrisCompanion/iris/DataSources/TFLDataSource.swift
@@ -48,6 +48,11 @@ final class TFLDataSource {
         }
     }
 
+    // Severity 4 = Planned Closure, 5 = Part Closure, 10 = Good Service
+    private static let ignoredSeverities: Set<Int> = [4, 5, 10]
+    // Severity 1 = Closed, 2 = Suspended, 3 = Part Suspended, 6 = Severe Delays
+    private static let majorSeverities: Set<Int> = [1, 2, 3, 6]
+
     private let config: TFLDataSourceConfig
     private var cache: (timestamp: Int, data: TFLData)?
 
@@ -99,12 +104,10 @@ final class TFLDataSource {
             guard !seenLines.contains(line.id) else { continue }
 
             for status in line.lineStatuses {
-                // Skip: 10 = Good Service, 4 = Planned Closure, 5 = Part Closure
-                guard status.statusSeverity < 10 else { continue }
-                guard status.statusSeverity != 4 && status.statusSeverity != 5 else { continue }
+                guard !Self.ignoredSeverities.contains(status.statusSeverity) else { continue }
 
                 seenLines.insert(line.id)
-                let isMajor = status.statusSeverity <= 3 || status.statusSeverity == 6
+                let isMajor = Self.majorSeverities.contains(status.statusSeverity)
 
                 let disruption = Disruption(
                     id: "\(line.id):\(status.statusSeverity)",