A man accused of causing the deaths of four people by dangerous driving told police he was satisfied that it had been safe to overtake two cars.
The prosecution argues 24-year-old Gordon Dyche was an impatient driver who was worried about being late for work.
But in a police interview Mr Dyche said he was sure he was going to make it to work on time.
Denise Griffith, 55, lost her husband, mother and two teenage foster sons when their car went into Llyn Clywedog, near Llanidloes, in April last year.
Mr Dyche was driving behind two vehicles - including Mrs Griffith's people carrier - and it is alleged he tried to overtake as Mrs Griffith was indicating right to pull into a lay-by.
Mr Dyche says he had checked the road ahead but had not seen the family's car indicating.
"I just saw the car across the road in front of me," he said.
Today Caernarfon Crown Court heard Mr Dyche knew the road along Llyn Clywedog well and was satisfied that his manoeuvre was safe.
The court also heard how after the crash Mr Dyche had jumped into the lake to see if he could help - but it was too dark and murky.
He'd helped Mrs Griffith, the sole survivor, out onto the rocks as help was summoned.
Mr Dyche, of Llanbrynmair, denies four charges of causing death by dangerous driving and four counts of causing death by careless driving.
The case continues.