The Big Projects In The Works For Massachusetts Roads & Rails

BOSTON (CBS) -- Whether you drive a car to work or jump on a train, big changes are in the works for Boston-area roads and rails. Here's a list of the multi-million dollar projects currently in the works for MassDOT and the MBTA.

Upcoming MassDOT Projects:

ALLSTON INTERCHANGE IMPROVEMENT PROJECT
Will straighten the Mass Pike and open up old rail yards to residential and commercial use. More info.

Estimated Cost: $1 Billion
Estimated Completion: 2025 (Phase I)

I-95 ADD-A-LANE
Will provide additional travel lane and shoulder on I-95 from Route 24 in Randolph to Route 9 in Wellesley. More info.

Cost: $350 Million
Estimated Completion: Spring 2019

LONGFELLOW BRIDGE
Will bring the historic bridge up to code and improve accessibility. More info.

Cost: $300 Million
Estimated Completion: August 2018

COMMONWEALTH AVENUE BRIDGE REPLACEMENT
Will restore the deteriorating bridge that carries Comm. Ave and the Green Line over the Mass Pike. More info.

Cost: $110 Million
Estimated Completion: 2019

EVERETT/MEDFORD BRIDGE REPLACEMENT, REVERE BEACH PARKWAY
Will replace non-operating drawbridge with new fixed bridge. More info

Cost: $81 Million
Estimated Completion: 2020

METHUEN ROTARY
Will alleviate traffic congestion and improve safety. More info.

Cost: $66 Million
Estimated Completion: Summer 2018

TOBIN BRIDGE REPAIRS
Will repair the upper and lower decks of Tobin Bridge. More info.

Cost: $41 Million
Estimated Completion: 2020

Upcoming MBTA Projects

SOUTH COAST RAIL SERVICES
Will restore Commuter Rail service between Boston and southeastern Mass., including New Bedford, Taunton and Fall River. More info.

Cost: $3.2 Billion
Estimated Completion: Unknown

Phase I/Middleboro Line estimated completion in 2022 at a cost of $935 million.

GREEN LINE EXTENSION
Will extend the MBTA's Green Line into Somerville and Medford. More info.

Cost: $2.3 Billion
Estimated Completion: 2021

RED LINE SOUTH SIDE PROJECTS
Will renovate Wollaston Station, upgrade infrastructure and pay for 252 new Red Line cars. More info.

Cost: $911 Million
Estimated Completion: 2019

AUTOMATED FARE COLLECTION
Will eliminate cash transactions when boarding the T. More info.

Cost: $701 Million
Estimated Completion: 2021

COMMUTER RAIL POSITIVE TRAIN CONTROL
Will allow on-board computers to slow down or stop a train if system detects a problem. More info.

Cost: $459 Million
Estimated Completion: End of 2018