Spare a thought for the mother with hot, irritable children in tow, trying to get to the other side of the road.

Typically timed to the pace of "a six-foot man", the crossing window disappears quickly for those with mobility issues or negotiating prams and toddlers.

"It's just time," Committee for Sydney policy manager Estelle Grech says.

"If you increase it, we can give a little bit more dignity in crossing the road," she told the Sweltering Cities Gender & Heat Community Symposium on Friday.

Ms Grech said design shortfalls that disproportionately burden women and other under-served groups are exacerbated by extreme heat.

"It makes it so much harder than it should be," she said.

As global temperatures trend higher, heatwaves are becoming increasingly frequent, long and severe.

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