classes = {
    0:'Speed limit (20km/h)', 1:'Speed limit (30km/h)', 2:'Speed limit (50km/h)',
    3:'Speed limit (60km/h)', 4:'Speed limit (70km/h)', 5:'Speed limit (80km/h)',
    6:'End of speed limit (80km/h)', 7:'Speed limit (100km/h)', 8:'Speed limit (120km/h)',
    9:'No passing', 10:'No passing veh over 3.5 tons', 11:'Right-of-way at intersection',
    12:'Priority road', 13:'Yield', 14:'Stop', 15:'No vehicles', 16:'Veh > 3.5 tons prohibited',
    17:'No entry', 18:'General caution', 19:'Dangerous curve left', 20:'Dangerous curve right',
    21:'Double curve', 22:'Bumpy road', 23:'Slippery road', 24:'Road narrows on the right',
    25:'Road work', 26:'Traffic signals', 27:'Pedestrians', 28:'Children crossing',
    29:'Bicycles crossing', 30:'Beware of ice/snow', 31:'Wild animals crossing',
    32:'End speed + passing limits', 33:'Turn right ahead', 34:'Turn left ahead',
    35:'Ahead only', 36:'Go straight or right', 37:'Go straight or left', 38:'Keep right',
    39:'Keep left', 40:'Roundabout mandatory', 41:'End of no passing', 42:'End no passing veh > 3.5 tons'
}