function roadRadar(input) {
    let limits = {
        'motorway': x => 130 - x,
        'interstate': x => 90 - x,
        'city': x => 50 - x,
        'residential': x => 20 - x
    }
    let speedingUp = {
        'less': '',
        20: 'speeding',
        40: 'excessive speeding',
        'more': 'reckless driving'
    }
    let speed = Number(input[0]);
    let area = input[1];
    let diff = limits[area](speed);

    function speeding(diff) {
        return diff >= 0 ? speedingUp['less'] :
            diff >= -20 ? speedingUp[20] :
            diff >= -40 ? speedingUp[40] : speedingUp['more']
    }
    console.log(speeding(diff));

}