Boston, MA– For this year’s unofficial celebration of marijuana on April 20, or 4/20, as it is more commonly known, ride-sharing company Lyft is offering Massachusetts passengers a discount of $4.20 off of one ride on Saturday 4/20. With this promotion, Lyft aims to prevent marijuana users from driving while impaired, in partnership with the Massachusetts Chiefs of Police Association and marijuana seller New England Treatment Access (NETA).

Lyft New England’s regional director Tyler George said: “We’re thrilled to be collaborating with the Massachusetts Chiefs of Police Association and NETA as we work toward a similar goal and commitment, as well as provide Boston residents with a responsible and reliable ride option.”

Use promo code 420BOS19 to get a discount off your Lyft ride on Saturday. Though the code says “BOS”, it will apply for any Lyft ride in Massachusetts on 4/20. The federal government still categorizes marijuana as a Schedule I substance (like heroin), so the Lyft discount only applies in areas where the sale of weed has been legalized.

With ridesharing services like Lyft available, no one should be driving under the influence on 4/20. Governor Charlie Baker has urged Massachusetts legislators to pass a law that would automatically suspend the license of any driver stopped by police who refuses a drug test, as a deterrent for driving while high. However, the existing drug tests for marijuana can detect the substance even if it’s been weeks since the user last indulged and the person is no longer under the influence. So it’s unclear how drug testing will be used as evidence against impaired drivers.

This will be the first 4/20 in Massachusetts since the first legal recreational marijuana dispensaries opened last year. So far, there are 15 dispensaries currently open where they sell recreational marijuana and cannabis products, with several more opening soon. However, the a high percentage of users are continuing to purchase marijuana on the black market, due to the ease and convenience of buying from their (often long-established) local weed dealer.

It’s also more expensive to purchase recreational marijuana legally. While medical marijuana is not subject to tax, recreational cannabis sales can be taxed at up to 20% (6.25% state sales tax, 10.75% marijuana excise tax, plus a maximum 3% local tax by the city). As access to marijuana increases with more and more stores opening, more people may decide to purchase it legally.

Regardless of where it’s sourced, using a ridesharing service or a designated driver is clearly a good idea. Have a safe 4/20!