def estimate_demand(vehicle_density, target_capacity, obf):
    """
    Function to estimate the capacity-demand for each section of road.

    Parameters
    ----------
    vehicle_density : float
        The number of vehicles per 1 kilometer stretch of road.
    target_capacity : int
        Target capacity per vehicle in Mbps.
    obf : int
        Overbooking factor.

    """
    demand = vehicle_density * target_capacity / obf

    return round(demand)