How to determine the highest number, second highest and third?

I would use this code as the custom calculation script of the field that should show the largest three values:

var fields = ["Crash20", "Crash25", "Crash30", "Crash35"];
var values = [];
for (var i in fields) {
    var v = this.getField(fields).valueAsString;
    if (v) values.push(Number(v));
}
values.sort(function(a,b){return Number(a) - Number(b);});
event.value = values.slice(0,3).join(", ");

Thank you fir you r response.

Can you be more descriptive? I put the following in the "Results" fieldvar aRslts = this.getField("Crash20").getArray().sort(function(a,b){return b.value > a.value;}).slice(0,3);

Named the speed accordingly: Crash20, Crash25, Crash30, Crash35.

A simple way to do this is to group the "# of crashes fields" using dot notation. For example "Crash.20", "Crash.25", etc. with this method you can extract and sort the results in a single line of code.

var aRslts = this.getField("Crash").getArray().sort(function(a,b){return b.value > a.value;}).slice(0,3);

This code returns an array of the 3 fields with the largest values. where the first field in the array has the largest value.

Formatting for output is just another step.

event.value = aRslts.map(function(a){return "Speed " + a.name.replace(/Crash\./,"") + ", " + a.value + " bike crashes";}).join("\n");

Note that this returns a multiline string, so the result field must be 3 lines in height.