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MINNEAPOLIS - A driver safety expert says it would have been hard for Amy Senser to see the man she is accused of killing in a hit-and-run accident in Minneapolis last summer.

Paul Olson testified Monday as Senser's attorneys began presenting her defense. The wife of former Minnesota Viking Joe Senser faces three felony charges.

Olson specializes in drivers' visual perceptions at night. He testified that Senser may have seen the flashing lights on the stalled car of the victim, restaurant cook Anousone Phanthavong.

But Olson says it would have been difficult for her to react given the lack of street lighting and the clutter of construction signs and material around the accident site.

Amy Senser was expected to testify later Monday.