Why does Jesus Christ Superstar end before the resurrection?

Why is there a bus in Jesus Christ Superstar?

The film’s cast and crew are seen traveling by bus to the Israeli desert, in order to re-enact the Passion of Christ. They assemble their props and get into costume. One of the group, Ted Neeley, is surrounded by the others. He puts on a white robe and emerges as Jesus (“Overture”).

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