I drove back down the motorway at normal speed.

我以正常速度沿高速公路往回开。

《柯林斯英汉双解大词典》

Special English broadcasters speak at two-thirds of normal speed.

“特别英语”节目广播员的语速是正常语速的三分之二。

youdao

High-speed rail train runs at over 250 km per hour, about twice the normal speed of a regular train.

高铁运行的速度超过每小时250公里，大约是普通列车正常运行速度的两倍。

youdao

Some of the tracks were recorded at normal speed and some were recorded at half speed.

VOA: special.2009.09.27

Played at normal speed, the half speed recordings sound twice as fast.

VOA: special.2009.09.27

From a standing start, the reconstructed beam sped back up to the normal speed of light.

BBC: NEWS | Science/Nature | Cool clouds turn light to matter

When the Artemis boat capsized Thursday, the winds were 18 to 20 knots, a normal speed for this time of year.

WSJ: Before America's Cup Capsize, Concerns About Safety

We also believe that economic growth will start to improve, going from a half-speed recovery to a more normal speed recovery.

FORBES: Magazine Article