While I find it fascinating to look at such diverse examples of gateway signage, considering the cultural context, isn't much of this thread placing the old "cart before the horse." When my boss at the local hospital asked for signage design ideas for the campus, I refused to go that route. Instead, I told him he'd get from me a written analysis of the entry and wayfinding problem based on my photographs of all the approaches to the campus, all existing signage, daytime and nighttime.
Standard planning process: inventory, analysis, recommendations. That report lit a fire under the board to finally hire a national signage firm to work on the design of wayfinding and identity systems, while I worked on plans for the spatial design of the campus gateways.
It seems that everybody in town likes the result. It really works. But none of this would have happened without the first steps of the design process and the 20-minute powerpoint in the boardroom summing up the problems and opportunities. If a planner doesn't take a firm hand when the community starts thinking about a new "entrance sign," it's all too likely that the result will just be one more object contributing to visual clutter at the city gateways.