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A Heterogeneous Vehicular Network (HetVNET) is a promising network system that integrates several network protocols or systems eg IEEE802. 11p, Short Range Communication, Third/Fourth Generation mobile networks etc. In HetVNET, wireless fidelity access points (Wi-Fi APs) must utilized by automobile end users to stabilise the Long-Term Evolution (LTE) 4G networks by way of offloading. No matter how usage of the opportunistic Wi-Fi APs to offload the LTE networks in a HetVNET system is comparatively more straightforward. This circumstances is due to the less area reached by Wi-Fi access points and weak placement strategies of access points. Many researcher have suggested that offloading schemes based on the historical wireless fidelity connection patterns noticed by an interest vehicle (IV) in making an offloading conclusion. However, based only on the historical connection patterns affects the prediction accuracy and offloading ratio of most existing schemes even when access point placement data is obtainable. This work suggested that the Opportunistic Offloading Scheme (OOS) is based on historical connection patterns and vehicular trajectory computation to predict the next accessible access point. The suggested plan is decentralised and focuses on urban scenarios whereby the likelihood of an IVto come into contact with Wi-Fi access points is high. We detect the complexity of the suggested Opportunistic Offloading Scheme in this work. The result shows that Opportunistic Offloading Scheme is linear dependent on the amount of the processed data accessible for the prediction.