Fire truck accessibility lab

regions · travel-time model · 100 m population grid

Region

Pick a region in the dropdown. More regions are possbile, ask me. Drag to pan; pinch, scroll or the + / − buttons zoom; a double-tap zooms in. With a mouse, click the map to add a station; on a touch screen press ＋ Station first. Tap a station to select it: switch it on or off, open its charts or delete it (you are asked first). Maximize the tool by clicking the fullscreen-toggle in the header.

Travel-time model

The travel time of every road segment is precomputed when the region is built. This page only selects the scenario.

Analysis

Max travel time: 8 min

Last-leg speed km/h

Grid and station connection. Every 100 m cell is connected to the road network. A cell with a permitted junction inside it is reached at that junction. A cell without one is connected to the nearest permitted junction, and the straight-line distance is added as a last leg at the speed above. Fire stations are connected to the network in the same way as cells. For motorway, motorway link, trunk and trunk link junctions, use the checkboxes below to decide whether those highway classes may provide such a connection. Unchecked highway classes remain drivable by trucks; they simply cannot be used as the access point from a cell or fire station to the network.

motorway motorway link trunk trunk link

Population (Zensus2022; zoomed in)

Fire stations

Chart basis cumulative

Export / import

Population of the region

Documentation

Travel-time scenarios. The travel time of every road segment and direction is precomputed when the region is built and delivered with the data. This page only selects one of the available scenarios; it neither derives nor shows how they are calculated. Segments a truck cannot use are blocked.

The four highway checkboxes affect only whether those highway classes may connect a cell or fire station to the network. They do not make the corresponding road itself undrivable.

Stations. Each station's time factor multiplies its travel time. A person counts for the station that reaches them fastest after the factor. "≤ T" and "> T" split those people by arrival time. Every station can be switched on or off without deleting it. Stations outside the region stay part of the calculation but are drawn faded and grouped separately. Deleting a station asks for confirmation.

Charts. The chart button of a station (and of the whole set) shows inhabitants, drivable road km and grid area by travel time, per minute or cumulative. The thick vertical line marks the maximum travel time. "Station alone" counts everything the station can reach; "where it is the fastest" counts only what it wins against the other active stations. Road km are attributed to the minute in which the nearer end of an edge is reached. Only roads and cells inside the region are counted.

Export / import. CSV (semicolon separated, decimal point) and XML contain, per station, its position (EPSG:3035 for real regions, local metres always), on/off, time factor and the key figures from the charts at the chosen maximum time, plus a SET row with the totals of all active stations. "Distribution CSV" holds the chart data per minute. Import reads CSV or XML by position and snaps stations to the nearest permitted junction; you can replace or add to the current stations.

Map. Drag to pan; pinch, scroll or the + / − buttons zoom; a double-tap zooms in; ⤢ fits the region. On a phone the panel is a sheet over the map: drag its handle, or tap it to cycle through small, medium and large. Green to orange: within the limit. Red to purple: beyond it. Grey: no truck can get there. Faded cells lie outside the region and are not counted. Minor roads, red traffic-signal dots and population numbers appear when you zoom in.

Source. Streetgraph, buildings and fire stations from OSM. Population from Zensus2022.

within the limit beyond it

no truck can get there

outside the region, not counted

Tap the map to place the station