No, tickets are not required as there is no entrance fee for the 'National Zeist Bridge.'
Tickets cannot be purchased on site for the 'National Zeist Bridge' because it is a publicly accessible structure with no associated entrance fee. There are no ticket counters, vending machines, or personnel selling entry to the bridge.
Visitors can approach and experience the bridge freely at any time without needing to acquire any form of admission. This applies universally to all visitors, making it a spontaneous and cost-free point of interest.