PORTSMOUTH — Seventy-five gallons of motor oil, diesel fuel and hydraulic oil spilled onto an Interstate 95 on-ramp after an Oct. 6 rollover crash now under investigation, according to New Hampshire State Police .

The 71-year-old driver, a Readfield, Maine resident, was hospitalized with minor injuries and cited for negligent driving by state police.

The on-ramp from the Portsmouth traffic circle to I-95 northbound was shut down by authorities for approximately five-and-a-half hours after the incident involving a tanker truck, police said.

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