Access, mapped: the strategic road network and the nodes hung off it
The motorway and trunk A-road network as continuous routes, every numbered motorway junction, and the 2,676 rail stations, 976 metro stops, ferry terminals, airports and coach stations that connect to it.
Site access is decided by junctions and stations, not by distance to a line on a map. The strategic road and access map holds the network as continuous routes and, more usefully, the points at which you can actually get on and off it.
Routes, not fragments
Motorways and trunk A roads come from OS Open Roads, chained into continuous routes by road number rather than left as survey segments. Local access roads are deliberately absent: this is the Strategic Road Network, roughly 15,000 km of it, and adding every residential street would bury the thing being shown.
The 667 numbered motorway junctions are the layer that answers most logistics questions. Access to the network is decided by junction proximity — a site two miles from a motorway with no junction for fifteen is not a site near a motorway.
The access nodes
From NaPTAN, the Department for Transport's register of public transport access points: 2,676 rail stations, 976 metro, underground and tram stops, 545 ferry terminals, 81 bus and coach stations and 48 airports.
Each is a station rather than a service. Frequency, destinations and whether anything actually stops there are not in this data, so proximity here is access in principle rather than in practice — and the 48 "airports" include grass strips and private fields, so it is not a count of commercial airports.
What NaPTAN leaves out
Bus stops. NaPTAN holds roughly 400,000 individual bus stops, which are unreadable at national zoom and are excluded here — so no coach station near a place says nothing about whether it has buses.
Alongside the register sit OpenStreetMap layers for the things no official national dataset covers well: EV charging points, park and ride sites, cycle hire docks, motorway service areas and level crossings. Those are volunteer-mapped, which means a location rather than a working connector, and an undercount by construction where a tag is applied inconsistently.
Sources
OS Open Roads via Esri UK and NaPTAN from the Department for Transport, under the Open Government Licence v3; charging points, park and ride, cycle hire and level crossings from OpenStreetMap via Overpass, under ODbL.