Assumptions

The example assumes that source files were previously compiled. Here's how it works:

VHDL source files describe the system	Tcl procedures create and connect the interface, plus the source files, to ModelSim	ModelSim commands are run via the new interface using the Tcl procedures
	draw_intersection
traffic.vhd queue.vhd tb_traffic.vhd	connect_lights	vsim -lib vhdl/work tb_traffic examine -value <light_timing>
	draw_queues
	draw_controls	force -freeze $var $val ns

The result is a traffic intersection interface similar to this illustration:

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