
    Write a function that analyzes a route status string and counts how many standard traffic condition codes ('std') are present, helping dispatchers determine the total number of required route modifications for delivery trucks. The function must identify all instances of 'std' regardless of their position in the status string, and each occurrence represents a point where the delivery route needs to be adjusted.
    

    
def count_occurance(s):
    """
    Write a function that analyzes a route status string and counts how many standard traffic condition codes ('std') are present, helping dispatchers determine the total number of required route modifications for delivery trucks. The function must identify all instances of 'std' regardless of their position in the status string, and each occurrence represents a point where the delivery route needs to be adjusted.
    

    """
def count_occurance(s):
    """
    Write a function that analyzes a route status string and counts how many standard traffic condition codes ('std') are present, helping dispatchers determine the total number of required route modifications for delivery trucks. The function must identify all instances of 'std' regardless of their position in the status string, and each occurrence represents a point where the delivery route needs to be adjusted.
    

    """
    count = 0
    for i in range(len(s) - 2):
        if s[i] == 's' and s[i + 1] == 't' and (s[i + 2] == 'd'):
            count = count + 1
    return count