From the massive Buland Darwaza in India to the turnstiles of the New York subway, gates have always provided the same utilitarian purpose of controlling ingress and egress at particular locations. The mechanism by which this happens can be vastly varied from gate to gate, but their function nevertheless remains the same.
Occasionally, someone comes along and puts a twist on classic convention. In this instance, a small car approaches what appears to be a cattle grid in the countryside. A traditional gate like this would normally require the driver to get out of his or her car to unlock and open the gate, and then exit the vehicle again to close the gate once they have driven through. Though typically more costly, you could also purchase an electronic gate, which could allow for access via keypad or remote sensor. That would, of course, assume you have access to electricity, or the means to pay for a solar installation.