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I visited Poland back in 1977 with my ex-pat parents and my older cousin drove us around in his Polski Fiat taxi and I was regularly seeing people walking down the road holding up a piece of white paper with a large red dot on it. I asked him what it was and he said it was a hitchhiking voucher. Seems people could buy pads of these vouchers and when someone gave them a ride, you gave the driver the voucher which they could redeem at gas stations.
