He is already dead.
So maybe this has been covered already. But since this movies is basically a flashback,he is already dead, that part is not disputable. However, I think, his journey, through the desert, is actually his trip through purgatory. Everyone he meets is basically a lost soul, but they are helping him on his destination. HIs wife was already dead from the surfing accident. Like Dante, he is traveling through purgatory to find his love. He is constantly tempted to be untrue, the gas station attendant and the nude girl, but he refuses. At the end, he see the light, between the bulldozers , like a tunnel into heaven, he knows on the other end is his lost love.
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