diff --git a/CHANGELOG.md b/CHANGELOG.md
index 71497b4e36..4faaa1a9e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,6 +42,7 @@ RELEASING:
 ### Deprecated
 ### Removed
 ### Fixed
+- access to roads where transporting hazardous materials is forbidden ([#1853](https://github.com/GIScience/openrouteservice/pull/1853))
 ### Security
 
 ## [8.1.3] - 2024-09-13
diff --git a/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/edgefilters/HeavyVehicleEdgeFilter.java b/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/edgefilters/HeavyVehicleEdgeFilter.java
index e78ee46ab3..b6cf2a9dc6 100644
--- a/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/edgefilters/HeavyVehicleEdgeFilter.java
+++ b/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/edgefilters/HeavyVehicleEdgeFilter.java
@@ -130,9 +130,9 @@ public void setDestinationEdge(EdgeIteratorState edge, Graph graph, FlagEncoder
 
                 if (!destinationEdges.contains(EdgeIteratorStateHelper.getOriginalEdge(edge))) {
                     int vt = gsHeavyVehicles.getEdgeVehicleType(EdgeIteratorStateHelper.getOriginalEdge(edge), buffer);
-                    boolean dstFlag = buffer[1] != 0; // ((buffer[1] >> (vehicleType >> 1)) & 1) == 1
+                    boolean dstFlag = buffer[1] != 0;
 
-                    if (((vt & vehicleType) == vehicleType) && (dstFlag))
+                    if (isVehicleType(vt, vehicleType) && (dstFlag))
                         destinationEdges.add(EdgeIteratorStateHelper.getOriginalEdge(edge));
                 }
 
@@ -148,22 +148,22 @@ public boolean accept(EdgeIteratorState iter) {
         int edgeId = EdgeIteratorStateHelper.getOriginalEdge(iter);
 
         int vt = gsHeavyVehicles.getEdgeVehicleType(edgeId, buffer);
-        boolean dstFlag = buffer[1] != 0; // ((buffer[1] >> (vehicleType >> 1)) & 1) == 1
+        boolean dstFlag = buffer[1] != 0;
 
         // if edge has some restrictions
         if (vt != HeavyVehicleAttributes.UNKNOWN) {
             if (mode == MODE_CLOSEST_EDGE) {
                 // current vehicle type is not forbidden
-                boolean edgeRestricted = ((vt & vehicleType) == vehicleType);
+                boolean edgeRestricted = isVehicleType(vt, vehicleType);
                 if ((edgeRestricted || dstFlag) && buffer[1] != vehicleType)
                     return false;
             } else if (mode == MODE_DESTINATION_EDGES) {
                 // Here we are looking for all edges that have destination
-                return dstFlag && ((vt & vehicleType) == vehicleType);
+                return dstFlag && isVehicleType(vt, vehicleType);
             } else {
                 // Check an edge with destination attribute
                 if (dstFlag) {
-                    if ((vt & vehicleType) == vehicleType) {
+                    if (isVehicleType(vt, vehicleType)) {
                         if (destinationEdges != null) {
                             if (!destinationEdges.contains(edgeId))
                                 return false;
@@ -171,7 +171,7 @@ public boolean accept(EdgeIteratorState iter) {
                             return false;
                     } else
                         return false;
-                } else if ((vt & vehicleType) == vehicleType)
+                } else if (isVehicleType(vt, vehicleType))
                     return false;
             }
         } else {
@@ -180,7 +180,7 @@ public boolean accept(EdgeIteratorState iter) {
             }
         }
 
-        if (hasHazmat && (vt & HeavyVehicleAttributes.HAZMAT) != 0) {
+        if (hasHazmat && isVehicleType(vt, HeavyVehicleAttributes.HAZMAT)) {
             return false;
         }
 
@@ -201,4 +201,8 @@ public boolean accept(EdgeIteratorState iter) {
         }
         return true;
     }
+
+    private boolean isVehicleType(int vt, int vehicleType) {
+        return (vt & vehicleType) == vehicleType;
+    }
 }
diff --git a/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/storages/HeavyVehicleAttributesGraphStorage.java b/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/storages/HeavyVehicleAttributesGraphStorage.java
index 95e8b9f1ae..7007f3c0c7 100644
--- a/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/storages/HeavyVehicleAttributesGraphStorage.java
+++ b/ors-engine/src/main/java/org/heigit/ors/routing/graphhopper/extensions/storages/HeavyVehicleAttributesGraphStorage.java
@@ -135,11 +135,11 @@ public boolean getEdgeRestrictionValues(int edgeId, double[] retValues) {
 
     public int getEdgeVehicleType(int edgeId, byte[] buffer) {
         long edgeBase = (long) edgeId * edgeEntryBytes;
-        orsEdges.getBytes(edgeBase + efVehicleType, buffer, 2);
+        orsEdges.getBytes(edgeBase + efVehicleType, buffer, 1);
 
         int result = buffer[0];
         if (result < 0)
-            result = (byte) (result & 0xff);
+            result = result & 0xFF;
 
         return result;
     }