Resumen
This paper provides empirical evidence on the methodological and practical issues when modelling signalised intersections under of informal public transport driver behavioural characteristics. Whilst the minibuses? (known as kombis in Zimbabwe) physical and dynamical properties is the same with private cars and therefore can be classified as homogenous, their driver behavioural characteristics make it a unique transportation mode with different operational performances as compared to normal private cars. Aggressive driver behaviour and lateral discipline of driving typify such behaviour. Yet there is scarce literature on how this behaviour violates the homogeneity assumption and the signalised intersection capacity estimation methodological issues there from.