Map data
Know what each marker position means.
ConePal combines accepted local gazetteer records with National Highways 2021 asset positions. The underlying records retain evidence statuses. These are explained below; the compact marker popup does not currently display each status. A precise coordinate is not an independent verification of its label.
Position statuses
- Verified 2021: a marker label has an evidence-supported transfer to a 2021 asset position.
- Sequence-inferred: a label is projected from neighbouring sequence evidence and is not independently verified.
- Accepted gazetteer: the published local coordinate is retained without claiming a 2021 match.
- Source position: an asset coordinate is displayed without a verified marker-post label transfer.
Limitations
Marker posts can be missing, moved, duplicated or recorded differently between sources. Road works, carriageway changes and source age can also affect real-world position. Confirm critical locations against current approved information and site conditions.
Planner use
The Job Planner uses an approximate 100 metre marker-post spacing rule. It is a planning aid, not an approved traffic-management design or substitute for competent review.
Sources and attribution
Contains Highways England data © Crown copyright. National marker-post sources include the 2021 National Highways release and the Strategic Road Network marker-post dataset, published under the Open Government Licence v3.0. This does not imply endorsement of ConePal or extend that licence to other sources.
Base-map data © OpenStreetMap contributors, available under the Open Database Licence. The map also displays the attribution required by its map provider.
ConePal maintains separate provenance and permission records for local reference and taper sources. These source files are not customer downloads.