Lake Pontchartrain Causeway shield

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Like many toll roads, the Lake Pontchartrain Causeway has a logo. Most signage directing drivers to the bridge just spell out its name, but the logo appears on tenth-mile markers along the bridge, in the same space normally reserved for a route shield. It’s pretty difficult to get the bridge’s long label to appear at any zoom level, so a more compact shield would improve usability.

After simplifying for a size of 20×20 pixels, the official logo would be too simple to be eligible for copyright protection:

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The route relations are tagged network=US:LA:Causeway with no ref.