The ICC connects the Gaithersburg area of Montgomery County with the Laurel area of Prince George’s County. (Mark Gail/The Washington Post)

Traffic on the Intercounty Connector toll highway in Montgomery and Prince George’s counties is growing at an average 2.6 percent per month, Maryland officials said Thursday.

In the fiscal year ending June 30, the highway (Route 200) had more than 17.2 million trips and generated $39.59 million in toll revenue, according to the Maryland Transportation Authority’s newly released annual financial statement. The authority, which operates the 18.8-mile road, had projected $39.56 million in revenue for the year, officials said.

Traffic, which averaged almost 40,000 vehicles on weekdays, was “slightly” lower than projected on the eastern end near Interstate 95 and “significantly” higher on the western end near the Interstate 270 corridor, officials said.

The highway, which has been open almost two years, is still in a ramp-up period, officials said. Construction on the final segment, which includes new lanes along I-95 near the ICC and an eastern extension from I-95 to U.S. Route 1, is schedule to open in spring 2014.