STR_CONFIG_SETTING_TOWN_TUNNELS_ALLOWED_OBSTRUCTION :Allowed only for small obstructions
STR_CONFIG_SETTING_TOWN_TUNNELS_ALLOWED :Allowed
STR_CONFIG_SETTING_NOISE_LEVEL :Allow town controlled noise level for airports: {STRING2}
STR_CONFIG_SETTING_NOISE_LEVEL_HELPTEXT :With this setting disabled, there can be two airports in each town. With this setting enabled, the number of airports in a town is limited by the noise acceptance of the town, which depends on population and airport size and distance