Yes, but you shouldn’t. Since shifting your gear while your vehicle is in operation might cause severe damage to your driveshaft, it is not advisable. You need to bring the vehicle to a complete stop before engaging in the low position. If you can, try stopping in a safe area away from traffic. After that, use the brakes as you would while parking. You should be able to adjust your shift lever after hitting the foot brake. Many vehicles need a little jiggle of the gear lever to enter the L position. Try pressing the shifter with extra energy if it doesn't seem to be going in. You may let off your foot brake when you're in low gear and ready to go. If you release the brake pedal, the automobile should accelerate. If you've put the auto in low gear, you may continue driving as usual. If you aren't accustomed to operating this way, exercise extra caution. You'll see that your vehicle doesn't speed up as quickly as it would if it were in D gear. That's the whole point of having a low-gear option! However, if you're unfamiliar with operating a car in L mode, it might confuse you a bit!