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Massachusetts
Massachusetts has the following two definitions for electric bicycles since November 8, 2022: Riders of these e-bikes do not require a license and are afforded all the rights and privileges related to all bicycle riders except as noted: These e-bikes are allowed most places traditional bicycles are allowed: roadways, bike lanes, bike paths, paved trails, and if specifically allowed by local jurisdiction and signage, natural surface trails. e-bikes are prohibited from sidewalks and most natural surface trails. Local jurisdictions may prohibit the use of e-bikes on bikeways and bike paths, but this first requires a public notice, public hearing, and posted signage prohibiting e-bikes.
 * Class I electric bicycle: Bicycle equipped with a motor that provides assistance only when the rider is pedaling, and that ceases to provide assistance when the e-bike reaches 20 mph, with an electric motor of 750 watts or less.
 * Class II electric bicycle: Bicycle equipped with a throttle-actuated motor that ceases to provide assistance when the e-bike reaches 20 mph, with an electric motor of 750 watts or less.

Massachusetts does not explicitly use the Federal definition of Class III, 28 mph pedal assist e-bikes. Massachusetts General Laws defines other classes of motorized two-wheeled vehicles that are not Class I or Class II electric bicycles: Motorcycle, Motorized bicycle, and Motorized scooter. Although the definition of motorized scooter includes two-wheeled vehicles propelled by electric motors with or without human power, motorized scooter specifically excludes anything which falls under the definitions of Class I or Class II electric bicycle, motorized bicycle, and motorcycle. Motorized bicycle is a pedal bicycle which has a helper motor, or a non-pedal bicycle which has a motor, with a cylinder capacity not exceeding fifty cubic centimeters, an automatic transmission, which is capable of a maximum speed of no more than thirty miles per hour, and does not fall under the specific definition of a Class I or Class II electric bicycle. Motorcycle includes any bicycle with a motor or driving wheel attached, with the exception of vehicles that fall under the specific definition of motorized bicycle. Thus, a pedal bicycle with an electric motor or a non-pedal bicycle with an electric motor, automatic transmission, maximum speed of 30 miles an hour, and not a Class I or Class II e-bike, would fall under the definition of motorized bicycle. An non-Class I or II electric bicycle that did not meet those restrictions would be either a motorized scooter or motorcycle, depending on specific characteristics.

A motorized bicycle cannot be operated by any person under sixteen years of age. Motorized bicycles also cannot be driven at a speed exceeding twenty-five Miles per Hour within the commonwealth, and they are explicitly prohibited from being driven on public highways, public walkways or other public land as designated by the parks department. A motorized bicycle cannot be operated by any person not possessing a valid driver's license or learner's permit. Every person operating a motorized bicycle upon has the right to use all public ways in the commonwealth except limited access or express state highways where signs specifically prohibiting bicycles have been posted, and are subject to the traffic laws and regulations of the commonwealth. Motorized bicycles may be operated on bicycle lanes adjacent to the various ways, but are excluded from off-street recreational bicycle paths. Every person operating a motorized bicycle or riding as a passenger on a motorized bicycle must wear protective headgear, and no person operating a motorized bicycle can permit any other person to ride a passenger on such motorized bicycle unless such passenger is wearing such protective headgear.

Architecture
ChromeOS is built on top of the Linux kernel. Originally based on Ubuntu, its base was changed to Gentoo Linux in February 2010. For Project Crostini, as of ChromeOS 80, Debian 10 (Buster) is the default container base image. In preliminary design documents for the ChromiumOS open-source project, Google described a three-tier architecture: firmware, browser and window manager, and system-level software and userland services.


 * The firmware contributes to fast boot time by not probing for hardware, such as floppy disk drives, that are no longer common on computers, especially netbooks. The firmware also contributes to security by verifying each step in the boot process and incorporating system recovery.
 * System-level software includes the Linux kernel that has been patched to improve boot performance. Userland software has been trimmed to essentials, with management by Upstart, which can launch services in parallel, re-spawn crashed jobs, and defer services in the interest of faster booting.
 * The window manager handles user interaction with multiple client windows (much like other X window managers).

In 2024 with version 124, Google's project Lacros (Linux And ChRome OS) created a Linux based Chrome browser binary (lacros-chrome) and separated it from the ChromeOS window manager and system UI binary (ash-chrome). This allows for the Chrome browser to receive updates independently from ChromeOS updates, with some performance/resource costs. Initially, only 1-2 milestones of version skew between lacros-chrome and ash-chrome are allowed.

Lacros Chrome browser may arrive on Chromebooks very soon (chromeunboxed.com)

Chromium Docs - Lacros (googlesource.com)