Councils will be given greater freedom to introduce 20mph schemes under new government proposals to improve road safety.
Local officials will also have more scope to cut speeds on rural roads with a history of accidents and introduce variable speed limits outside schools as part of the updated Department for Transport guidance.
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Dashcam footage captured the tree crashing down onto 40-year-old Sarah Robb's BMW just after she left her home in Syston on Thursday.
The teenagers, aged 19 to 15, appeared in custody at Westminster Magistrates' Court on Saturday, supported by their families.
Labour must "broaden its reach" in order to win votes off the Conservatives, deputy leader Tom Watson has said.