Real-time traffic flow and incident information based on the ‘HERE
Traffic’ API. The traffic flow data contains speed ("SP")
and congestion (jam factor: "JF") information. Traffic
incidents contain information about location, time, duration, severity,
description and other details.
In order to request the traffic flow, areas of interest (AOIs) have
to be provided. The AOIs must be an sf object containing a
polygon or multiple polygons. The response from the HERE Traffic API
will be spatially joined on the AOIs and thereby the traffic flows are
mapped to the corresponding polygon.
flows <- flow(
aoi = aoi[1, ]
)Print the (ordered) ‘jam factor’ of the traffic flow on an interactive leaflet map:
flows <- flows[order(flows$jam_factor), ]
rownames(flows) <- NULL
if (requireNamespace("mapview", quietly = TRUE)) {
mapview::mapview(flows,
zcol = "jam_factor",
layer.name = "Jam factor",
map.types = c("Esri.WorldTopoMap"),
homebutton = FALSE
)
}AOIs also must be provided in order to request information about
traffic incidents in specific regions. The time interval, which defines
the traffic incidents that should be considered, can be specitified by
the from and to parameter. The datetime
information passed to the function must be a timestamp of type
POSIXct. By default, no time interval filter is set.
incidents <- incident(
aoi = aoi[1, ]
)Print the traffic incidents on an interactive leaflet map:
if (requireNamespace("mapview", quietly = TRUE)) {
mapview::mapview(incidents,
zcol = "type",
layer.name = "Incident type",
map.types = c("Esri.WorldTopoMap"),
homebutton = FALSE
)
}