The relation between speed $u$ (in $\mathrm{km} / \mathrm{h}$ ) and density $k$ (number of vehicles $/ \mathrm{km}$ ) for a traffic stream on a road is $u=70-0.7 k .$ The capacity on this road is____

The relation between speed $u$ (in $\mathrm{km} / \mathrm{h}$ ) and density $k$ (number of vehicles $/ \mathrm{km}$ ) for a traffic stream on a road is $u=70-0.7 k .$ The capacity on this road is____

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