Lychgates, also sometimes called resurrection gates, are a curious English (though not exclusively) phenomenon.
The name derives from the Old English word lych, or lich, meaning body, referring to entrance to the churchyard though which the body of the deceased was carried. This was seen as the beginning of the path towards resurrection by being buried in holy ground.
In medieval times, signs and symbols carried a lot of weight as most of the population were illiterate. Nevertheless, it would be a mistake to think that signs and symbols don’t carry as much weight today. We just have to read and understand them.