Getting from Victoria Falls to Kariba and vice versa has in recent years been a real problem. The drive on the Zimbabwe side is extremely long and arduous, the only route is via Karoi and Binga.It is a remote dirt road through the mountains behind Matusadona and is only recommended for 4 x 4's or seasoned travelers. You can drive through Zambia, this is a good tarred road, and will take you approximately 6 to 7 hours via Siavonga and Livingstone. However depending on your passport you might incur the costs of a Visa to enter Zambia as well as additional vehicle entry costs. Activity takes roughly 7 hours.