diff --git a/R/collisions-locations.R b/R/collisions-locations.R
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+++ b/R/collisions-locations.R
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+#' Download collisions data from stats19
+#'
+#' @param bbox either a bounding box in the form w,s,e,n or an exact boundary as csv string of longitude/latitudes:
+#' @param casualtiesinclude a text string specifying the type of casualty
+#' (as of May 2018 only `cyclist` is supported)
+#' @param field string/number specifying the variables returned (all returned by default)
+#' @param limit an integer specifying the number of casualties returned
+#' default 400, max 2000
+#' @param jitter 1|0, default 0
+#' @param format string, default geojson
+#' @param datetime string  specifying the output format of the date with the default of
+#' sqldatetime (i.e. simplified ISO 8601 format): YYYY-MM-DD HH:MM:SS
+#' @export
+#' @examples
+#' \dontrun{
+#' # example of from https://www.cyclestreets.net/api/v2/collisions.locations/
+#' }
+collisions <- function(bbox, casualtiesinclude, field, limit = 400, jitter = 0, format = "geojson", datetime = "sqldatetime") {
+  # ... wip ...
+}