
    Write a function that validates a route identifier number where each digit represents a traffic density level (0-9), ensuring that the occurrence of each density level across route segments does not exceed the actual density value itself. For example, in a route number, the digit 3 (representing moderate traffic) should not appear more than 3 times, and this rule applies to all digits in the route number.
    

    
def validate(n):
    """
    Write a function that validates a route identifier number where each digit represents a traffic density level (0-9), ensuring that the occurrence of each density level across route segments does not exceed the actual density value itself. For example, in a route number, the digit 3 (representing moderate traffic) should not appear more than 3 times, and this rule applies to all digits in the route number.
    

    """
def validate(n):
    """
    Write a function that validates a route identifier number where each digit represents a traffic density level (0-9), ensuring that the occurrence of each density level across route segments does not exceed the actual density value itself. For example, in a route number, the digit 3 (representing moderate traffic) should not appear more than 3 times, and this rule applies to all digits in the route number.
    

    """
    for i in range(10):
        temp = n
        count = 0
        while temp:
            if temp % 10 == i:
                count += 1
            if count > i:
                return False
            temp //= 10
    return True