Add shields to on and off ramps
When a road type ramp has a route number on it, a shield should be generated for the navigation instruction. For example, a on-ramp named "to US-27" should produce "to <US-27 shield>". Similarly: "Exit 29: US-19 / US-23 / SR-43" should produce "Exit 29: <US-19 shield> <US-23 shield> <SR-43 shield>.
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