Regional transportation planners are eyeing a series of small changes they hope will alleviate congestion along the Interstate 205 corridor in the coming years — without the money for big-ticket projects they say will be needed someday.Those larger efforts remain in long-term plans. But an ongoing study of the I-205 corridor aims to identify some ways to buy time and improve conditions until more funding becomes available.“The goal is to complete the study with some recommendations for some short-term, operational fixes,” said Matt Ransom, executive director of the Southwest Washington Regional Transportation Council.Those might include ramp meters to stagger traffic entering the freeway at certain spots. New striping, lane reconfiguration and lengthening merge lanes are also possibilities, Ransom said.At the RTC’s monthly board meeting this week, ramp meters dominated much of the discussion. The devices, which use alternating signals to control the flow of vehicles through an onramp, are common on Portland-area freeways. The Washington State Department of Transportation operates a meter at the ramp funneling traffic from state Highway 14 and downtown Vancouver onto southbound Interstate 5. The meters operate only at certain times of day.