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Several VANET-based safety applications require information dissemination to all vehicles within a certain area for a certain time. Among the existing information dissemination protocols for VANETs, only Stored Geocast provides retention of information within a pre-determined area of the road for a duration of time. However, the overhead incurred by it is large. In this paper, we propose and evaluate ZBF, a zone based forwarding scheme for information dissemination which provides both a spatial and temporal retention of information and incurs less overhead than Stored Geocast.