def convert_time_to_ms(driver_dict):
    """
    This function loops through the race results and converts a string with the time in the format mm:ss:msms
    to a single value in milliseconds (ms).

    Parameters:
        driver_dict (dict): A dictionary representation of a driver's race result.

    Returns:
        (int): The driver's fastest lap time in milliseconds.
    """

    lap_time_str = driver_dict['fastest_lap'].split(':')
    lap_time_ms = (int(lap_time_str[0])*60000) + (int(lap_time_str[1])*1000) + (int(lap_time_str[2]))

    return lap_time_ms