Determine the adjusted saturation flow rate for a lane group comprised of two lanes for the through movement, under the following conditions:

Base rate $=1900p\frac{c}{h}\frac{?}{ln}$

Lane width $=9\mathrm{.}5ft$

Heavy vehicles $=4\%$ of the traffic stream

Approach grade $=+3\%$

No on$-$street parking

No bus stops

Bicycle and pedestrian traffic conflicting with this lane group is negligible

Intersection is in a central business district